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SUD19 - Annual parallax measurements of a semi-regular variable star SV Pegasus with VERA

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Short title: Sudou et al. (2019)
Authors: Sudou, HiroshiOmodaka, ToshihiroMurakami, KotoneNagayama, TakahiroNakagawa, AkiharuUrago, RikuNagayama, TakumiHirano, KenHonma, Mareki
Journal: Publications of the Astronomical Society of Japan, Volume 71, Issue 1, id.16
Bibcode:

Target type: star

Abstract
Many studies have shown that there are clear sequences in the period-luminosity relationship (PLR) for Mira variables and semi-regular variables (SRVs) in the Large Magellanic Cloud (LMC). To investigate the PLR for SRVs in our galaxy, we examined the annual parallax measurement and conducted K'-band photometric monitoring of an SRV star SV Pegasus (SV Peg). We measured the position change of the associated H2O maser spots by phase-referencing Very Long Baseline Interferometry (VLBI) observations with VERA at 22 GHz, spanning approximately 3 yr, and detected an annual parallax of π = 3.00 � 0.06 mas, corresponding to a distance of D = 333 � 7 pc. This result is in good agreement with the Hipparcos parallax and improves the accuracy of the distance from 35% to 2%. However, the Gaia DR2 catalog gave a parallax of π = 1.12 � 0.28 mas for SV Peg. This indicates that the Gaia result might be blurred by the effect of the stellar size because the estimated stellar radius was ∼5 mas, which is comparable to the parallax. We obtained a K'-band mean magnitude of m_{K^' }} = -0.48mag and a period of P = 177 d from our photometric monitoring with a 1 m telescope. Using the trigonometric distance, we derived an absolute magnitude of M_{K^' }}=-8.09 � 0.05mag. This result shows that the position of SV Peg in the PLR falls on the C' sequence found in the PLR in the LMC, which is similar to other SRVs in our galaxy.

Abstract

Many studies have shown that there are clear sequences in the period-luminosity relationship (PLR) for Mira variables and semi-regular variables (SRVs) in the Large Magellanic Cloud (LMC). To investigate the PLR for SRVs in our galaxy, we examined the annual parallax measurement and conducted K'-band photometric monitoring of an SRV star SV Pegasus (SV Peg). We measured the position change of the associated H2O maser spots by phase-referencing Very Long Baseline Interferometry (VLBI) observations with VERA at 22 GHz, spanning approximately 3 yr, and detected an annual parallax of π = 3.00 � 0.06 mas, corresponding to a distance of D = 333 � 7 pc. This result is in good agreement with the Hipparcos parallax and improves the accuracy of the distance from 35% to 2%. However, the Gaia DR2 catalog gave a parallax of π = 1.12 � 0.28 mas for SV Peg. This indicates that the Gaia result might be blurred by the effect of the stellar size because the estimated stellar radius was ∼5 mas, which is comparable to the parallax. We obtained a K'-band mean magnitude of m_{K^' }} = -0.48mag and a period of P = 177 d from our photometric monitoring with a 1 m telescope. Using the trigonometric distance, we derived an absolute magnitude of M_{K^' }}=-8.09 � 0.05mag. This result shows that the position of SV Peg in the PLR falls on the C' sequence found in the PLR in the LMC, which is similar to other SRVs in our galaxy.

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Detection table from Sudou et al. (2019)

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ID	Obs. RA	Obs. Dec	RA offset	Dec offset	l	b	Group id	#	Maser spot	Source name	Image	Descr.	Line	V_peak	μ_X	μ_Y	F_peak	Telescope	Detection	Class	Dist. (parallax)	Date
	(J2000)	(J2000)	(mas)	(mas)	(deg.)	(deg.)							H₂O	(km/s)	(mas/yr)	(mas/yr)	(Jy/beam)		Yes/No		(kpc)
1	+22 05 42.08385	+35 20 54.528			88.7151845	-16.285514	G88.715-16.285			SV Pegasus	Image	Descr	22 GHz;					VERA	+H₂O +OH +SiO	EVOLVED	0.333 (0.007)	2012 Jun - 2015 Apr
	+22 05 42.09293	+35 20 54.44035	136.11 mas	-87.65 mas	88.715194	-16.285552		1	1	SV Pegasus				3.21	0.84 (0.91)	0.04 (0.50)	5.97
	+22 05 42.0930093	+35 20 54.44058	137.3 mas	-87.42 mas	88.715195	-16.285552		2	2	SV Pegasus				3.63	-0.04 (0.75)	-0.12 (0.47)	4.18
	+22 05 42.0931193	+35 20 54.44121	138.95 mas	-86.79 mas	88.715195	-16.285552		3	3	SV Pegasus				4.05	-1.17 (0.73)	-0.59 (0.48)	1.58
	+22 05 42.093582	+35 20 54.44217	145.89 mas	-85.83 mas	88.715197	-16.285553		4	4	SV Pegasus				4.47	-5.47 (1.87)	-1.31 (0.45)	0.71
	+22 05 42.093124	+35 20 54.43812	139.02 mas	-89.88 mas	88.715195	-16.285553		5	5	SV Pegasus				3.63	0.05 (0.86)	1.23 (0.61)	0.99
	+22 05 42.0931293	+35 20 54.44129	139.1 mas	-86.71 mas	88.715195	-16.285552		6	6	SV Pegasus				4.05	0.11 (0.54)	-0.39 (0.53)	5.28
	+22 05 42.0932207	+35 20 54.43972	140.47 mas	-88.28 mas	88.715195	-16.285553		7	7	SV Pegasus				4.47	-0.33 (0.55)	0.09 (0.47)	1.91
	+22 05 42.0933087	+35 20 54.44005	141.79 mas	-87.95 mas	88.715195	-16.285553		8	8	SV Pegasus				4.89	-0.67 (0.62)	-0.13 (0.45)	2.31
	+22 05 42.0933267	+35 20 54.44061	142.06 mas	-87.39 mas	88.715196	-16.285553		9	9	SV Pegasus				5.31	-0.67 (0.67)	-0.39 (0.47)	1
	+22 05 42.0923473	+35 20 54.45311	127.37 mas	-74.89 mas	88.715195	-16.285548		10	10	SV Pegasus				2.79	2.01	-2.65	0.6
	+22 05 42.0924853	+35 20 54.44604	129.44 mas	-81.96 mas	88.715194	-16.285550		11	11	SV Pegasus				3.21	0.58 (0.86)	2.92 (0.74)	1.04
	+22 05 42.092212	+35 20 54.45053	125.34 mas	-77.47 mas	88.715194	-16.285548		12	12	SV Pegasus				3.63	4.27 (1.49)	-0.12 (2.27)	2.4
	+22 05 42.0921713	+35 20 54.45031	124.73 mas	-77.69 mas	88.715194	-16.285548		13	13	SV Pegasus				4.05	5.11 (0.81)	0.25 (3.11)	2.17
	+22 05 42.0916713	+35 20 54.45625	117.23 mas	-71.75 mas	88.715194	-16.285546		14	14	SV Pegasus				5.73			1.18
	+22 05 42.091876	+35 20 54.4599	120.3 mas	-68.1 mas	88.715195	-16.285546		15	15	SV Pegasus				6.15	-4.25	-2.84	1.51
	+22 05 42.0919027	+35 20 54.45858	120.7 mas	-69.42 mas	88.715195	-16.285546		16	16	SV Pegasus				6.57	-4.76 (2.05)	-2.09 (1.65)	0.54
	+22 05 42.0914607	+35 20 54.45214	114.07 mas	-75.86 mas	88.715192	-16.285546		17	17	SV Pegasus				7.01	-1.15	1.45	3.4
	+22 05 42.0913487	+35 20 54.45662	112.39 mas	-71.38 mas	88.715193	-16.285545		18	18	SV Pegasus				7.43			1.1
	+22 05 42.0919207	+35 20 54.46623	120.97 mas	-61.77 mas	88.715196	-16.285544		19	19	SV Pegasus				5.73	-4.21 (1.14)	-6.19 (2.34)	0.56
	+22 05 42.0918133	+35 20 54.46282	119.36 mas	-65.18 mas	88.715195	-16.285545		20	20	SV Pegasus				6.15	-3.07 (0.89)	-3.93 (1.82)	1.37
	+22 05 42.0916673	+35 20 54.4564	117.17 mas	-71.6 mas	88.715194	-16.285546		21	21	SV Pegasus				6.57	-1.28 (0.73)	1.15 (1.04)	1.71
	+22 05 42.0915607	+35 20 54.45498	115.57 mas	-73.02 mas	88.715193	-16.285546		22	22	SV Pegasus				7.01			0.74
	+22 05 42.0926027	+35 20 54.44852	131.2 mas	-79.48 mas	88.715195	-16.285550		23	23	SV Pegasus				3.21			0.43
	+22 05 42.0930427	+35 20 54.45269	137.8 mas	-75.31 mas	88.715197	-16.285550		24	24	SV Pegasus				3.63	-1.33 (0.59)	-1.27 (0.79)	0.64
	+22 05 42.0931093	+35 20 54.4573	138.8 mas	-70.7 mas	88.715198	-16.285549		25	25	SV Pegasus				4.05	-1.64	-2.84	0.46
	+22 05 42.092318	+35 20 54.45463	126.93 mas	-73.37 mas	88.715195	-16.285548		26	26	SV Pegasus				3.63	3.89 (1.15)	-2.48 (0.59)	1.23
	+22 05 42.0922267	+35 20 54.45471	125.56 mas	-73.29 mas	88.715195	-16.285548		27	27	SV Pegasus				4.05	5.34	-2.51	1.39
	+22 05 42.0924373	+35 20 54.45526	128.72 mas	-72.74 mas	88.715196	-16.285548		28	28	SV Pegasus				4.47			0.72
	+22 05 42.0927633	+35 20 54.44154	133.61 mas	-86.46 mas	88.715194	-16.285552		29	29	SV Pegasus				4.05	2.01	-1.17	0.99
	+22 05 42.0923067	+35 20 54.45452	126.76 mas	-73.48 mas	88.715195	-16.285548		30	30	SV Pegasus				4.47			0.84
	+22 05 42.0923507	+35 20 54.457	127.42 mas	-71 mas	88.715196	-16.285547		31	31	SV Pegasus				4.47			0.6
	+22 05 42.0924847	+35 20 54.4576	129.43 mas	-70.4 mas	88.715196	-16.285547		32	32	SV Pegasus				4.47			0.57
	+22 05 42.093096	+35 20 54.4399	138.6 mas	-88.1 mas	88.715195	-16.285553		33	33	SV Pegasus				4.47			1.02
	+22 05 42.0933407	+35 20 54.4401	142.27 mas	-87.9 mas	88.715195	-16.285553		34	34	SV Pegasus				4.47			0.99
	+22 05 42.0934233	+35 20 54.43966	143.51 mas	-88.34 mas	88.715196	-16.285553		35	35	SV Pegasus				5.31			0.62
	+22 05 42.0928813	+35 20 54.45502	135.38 mas	-72.98 mas	88.715197	-16.285549		36	36	SV Pegasus				3.63			0.65
	+22 05 42.0928793	+35 20 54.45503	135.35 mas	-72.97 mas	88.715197	-16.285549		37	37	SV Pegasus				4.05			0.38
	+22 05 42.0914927	+35 20 54.46077	114.55 mas	-67.23 mas	88.715194	-16.285545		38	38	SV Pegasus				4.47			1.49
	+22 05 42.0914787	+35 20 54.46095	114.34 mas	-67.05 mas	88.715194	-16.285545		39	39	SV Pegasus				4.89			1.22
	+22 05 42.0914967	+35 20 54.45642	114.61 mas	-71.58 mas	88.715193	-16.285546		40	40	SV Pegasus				5.31			1.41
	+22 05 42.087136	+35 20 54.31866	49.2 mas	-209.34 mas	88.715157	-16.285567		41	41	SV Pegasus				5.31			1.21
	+22 05 42.0918607	+35 20 54.45734	120.07 mas	-70.66 mas	88.715194	-16.285546		42	42	SV Pegasus				5.73			1.53
	+22 05 42.092122	+35 20 54.48434	123.99 mas	-43.66 mas	88.715200	-16.285541		43	43	SV Pegasus				7.01			1.46
	+22 05 42.091458	+35 20 54.45798	114.03 mas	-70.02 mas	88.715193	-16.285545		44	44	SV Pegasus				6.15			0.39
	+22 05 42.0914467	+35 20 54.45804	113.86 mas	-69.96 mas	88.715193	-16.285545		45	45	SV Pegasus				6.57			0.42
	+22 05 42.0931087	+35 20 54.43851	138.79 mas	-89.49 mas	88.715195	-16.285553		46	46	SV Pegasus				4.89			0.56
	+22 05 42.0931007	+35 20 54.43851	138.67 mas	-89.49 mas	88.715195	-16.285553		47	47	SV Pegasus				5.31			0.34
	+22 05 42.092934	+35 20 54.44095	136.17 mas	-87.05 mas	88.715194	-16.285552		48	48	SV Pegasus				3.63			0.47
	+22 05 42.0943727	+35 20 54.44842	157.75 mas	-79.58 mas	88.715200	-16.285553		49	49	SV Pegasus				7.01			1.09
	+22 05 42.095668	+35 20 54.49475	177.18 mas	-33.25 mas	88.715212	-16.285546		50	50	SV Pegasus				2.37			0.73
	+22 05 42.0933553	+35 20 54.43817	142.49 mas	-89.83 mas	88.715195	-16.285553		51	51	SV Pegasus				5.31			0.37
	+22 05 42.0932533	+35 20 54.46121	140.96 mas	-66.79 mas	88.715199	-16.285548		52	52	SV Pegasus				3.63			0.56
	+22 05 42.090304	+35 20 54.44934	96.72 mas	-78.66 mas	88.715189	-16.285545		53	53	SV Pegasus				5.73			0.51

DSS colored	2MASS colored	WISE colored
SDSS color	IRAC color I1,I2,I4	GLIMPSE 360
PACS color (70-160 um)	SPIRE color (250-500 um)	NVSS (1.4GHz)
ATLASGAL 870 um	ATLASGAL 870 um + Planck	Bolocam 1.1 mm
UKIDSS K Download UKIDSS K FITS	2MASS K Download 2MASS K FITS

select MAX(h2o_data_all.ra_hms) as ra_hms,MAX(h2o_data_all.dec_dms) as dec_dms,MAX(h2o_data_all.source_name) as source_name,MAX(h2o_data_all.ra) as ra,MAX(h2o_data_all.dec) as dec,MAX(h2o_data_all.l) as l,MAX(h2o_data_all.b) as b,MAX(h2o_data_all.grp) as grp,MAX(h2o_data_all.other_name) as other_name,MAX(h2o_data_all.other_desc) as other_desc,BOOL_OR(thermal) as thermal,MAX(h2o_data_all.line) as line,MAX(h2o_data_all.vrange) as vrange,MAX(h2o_data_all.vpeak) as vpeak,MAX(h2o_data_all.peak) as peak,MAX(h2o_data_all.fwhm) as fwhm,MAX(h2o_data_all.int) as int,MAX(h2o_data_all.rms) as rms,MAX(h2o_data_all.units) as units,MAX(h2o_data_all.units_rms) as units_rms,MAX(h2o_data_all.date_txt) as date_txt,MAX(h2o_data_all.telescope_ref) as telescope_ref,MAX(h2o_data_all.telescope_conf) as telescope_conf,MAX(h2o_data_all.v_step) as v_step,MAX(h2o_data_all.beam) as beam,MAX(h2o_data_all.beam_maj) as beam_maj,MAX(h2o_data_all.beam_min) as beam_min,MAX(h2o_data_all.beam_pa) as beam_pa,MAX(h2o_data_all.ref) as ref,MAX(h2o_data_all.list_ref) as list_ref,MAX(h2o_data_all.ascii) as ascii,MAX(h2o_data_all.url) as url,MAX(h2o_data_all.image) as image,MAX(h2o_data_all.image2) as image2,MAX(h2o_data_all.image3) as image3,MAX(h2o_data_all.descr) as descr,MAX(h2o_data_all.id) as id,BOOL_OR(mjy_flag) as mjy_flag,BOOL_OR(rms_mjy_flag) as rms_mjy_flag,MAX(h2o_data_all.dist) as dist,1 as dist_parallax,MAX(h2o_data_all.date_txt) as date_txt,MAX(line_det) as line_det,MAX(type) as type,MAX(simbad_types_cat) as simbad_types_cat FROM h2o_data_all  LEFT JOIN all_objects_withmet ON h2o_data_all.grp=all_objects_withmet.group_name LEFT JOIN object_categories ON all_objects_withmet.group_name = object_categories.group_name_cat AND object_categories.tbl_cat = 'all_objects_withmet' LEFT JOIN transitions ON h2o_data_all.line=transitions."Line"  WHERE ref ilike 'SUD19' AND detected=true AND hide=false GROUP BY ref

select h2o_data_all.ra_hms,h2o_data_all.dec_dms,h2o_data_all.source_name,h2o_data_all.ra,h2o_data_all.dec,h2o_data_all.l,h2o_data_all.b,h2o_data_all.grp,h2o_data_all.other_name,h2o_data_all.other_desc,h2o_data_all.thermal,h2o_data_all.line,h2o_data_all.vrange,h2o_data_all.vpeak,h2o_data_all.peak,h2o_data_all.fwhm,h2o_data_all.int,h2o_data_all.rms,h2o_data_all.units,h2o_data_all.units_rms,h2o_data_all.date_txt,h2o_data_all.telescope_ref,h2o_data_all.telescope_conf,h2o_data_all.v_step,h2o_data_all.beam,h2o_data_all.beam_maj,h2o_data_all.beam_min,h2o_data_all.beam_pa,h2o_data_all.ref,h2o_data_all.list_ref,h2o_data_all.ascii,h2o_data_all.url,h2o_data_all.image,h2o_data_all.image2,h2o_data_all.image3,h2o_data_all.descr,h2o_data_all.id,h2o_data_all.mjy_flag,h2o_data_all.rms_mjy_flag,h2o_data_all.dist,h2o_data_all.dist_parallax,h2o_data_all.date_txt,line_det,type,simbad_types_cat FROM h2o_data_all   LEFT JOIN all_objects_withmet ON h2o_data_all.grp=all_objects_withmet.group_name LEFT JOIN object_categories ON all_objects_withmet.group_name = object_categories.group_name_cat AND object_categories.tbl_cat = 'all_objects_withmet' LEFT JOIN transitions ON h2o_data_all.line=transitions."Line"  WHERE ref ilike 'SUD19' AND detected=true AND hide=false ORDER BY detected DESC,id

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SUD19 - Annual parallax measurements of a semi-regular variable star SV Pegasus with VERA

Interferometry data

View as list of objects

Detection table from Sudou et al. (2019)