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ZHA17 - VLBA Trigonometric Parallax Measurement of the Semi-regular Variable RT Vir

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Short title: Zhang et al. (2017)
Authors: Zhang, BoZheng, XingwuReid, Mark J.Honma, MarekiMenten, Karl M.Brunthaler, AndreasKim, Jaeheon
Journal: The Astrophysical Journal, Volume 849, Issue 2, article id. 99, 11 pp. (2017).
Bibcode:

Target type: star

Abstract
We report a trigonometric parallax measurement of 22 GHz H₂O masers toward the semi-regular variable RT Vir from multi-epoch Very Long Baseline Array observations. The parallax of 4.417 Â� 0.134 mas, corresponding to a distance of 226 Â� 7 pc, is significantly different from the Hipparcos parallax, but is consistent with a distance derived from the period-luminosity relation (PLR). This suggests that the Hipparcos parallax suffers from systematic bias, possibly owing to a variable photo-center for this giant star. As such, VLBI parallax measurements will serve as an important cross-check for Gaia. Combing our RT Vir parallax with other long period variable parallaxes, we find a Galactic PLR at an infrared K band of {M}_K=-3.52{log}P+(1.10+/- 0.08), assuming that the slope of the Large Magellanic Cloud relation is the same to that of our Galaxy.

Abstract

We report a trigonometric parallax measurement of 22 GHz H₂O masers toward the semi-regular variable RT Vir from multi-epoch Very Long Baseline Array observations. The parallax of 4.417 Â� 0.134 mas, corresponding to a distance of 226 Â� 7 pc, is significantly different from the Hipparcos parallax, but is consistent with a distance derived from the period-luminosity relation (PLR). This suggests that the Hipparcos parallax suffers from systematic bias, possibly owing to a variable photo-center for this giant star. As such, VLBI parallax measurements will serve as an important cross-check for Gaia. Combing our RT Vir parallax with other long period variable parallaxes, we find a Galactic PLR at an infrared K band of {M}_K=-3.52{log}P+(1.10+/- 0.08), assuming that the slope of the Large Magellanic Cloud relation is the same to that of our Galaxy.

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Detection table from Zhang et al. (2017)

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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	π	F_peak	Telescope	Beam	PA	Detection	Class	Dist. (parallax)	Date
	(J2000)	(J2000)	(mas)	(mas)	(deg.)	(deg.)							H₂O	(km/s)	(mas/yr)	(mas/yr)	(mas)	(Jy/beam)		(arcsec)	(deg.)	Yes/No		(kpc)
1	+13 02 38.0131	+05 11 8.1675			310.3574175	67.8957936	G310.357+67.896			RT Vir	Image	Descr	22 GHz;	16.8				11.5	VLBA	0.0014 x 0.0009	34	+H₂O +OH +SiO	EVOLVED	0.226 (0.007)	2014 Jan - Dec
	+13 02 38.013096	+05 11 8.16756	0 mas	0 mas	310.357417	67.895794		1	All	RT Vir							4.417 (0.134)
	+13 02 38.0136113	+05 11 8.16103	7.73 mas	-6.53 mas	310.357423	67.895792		2	A	RT Vir					34.84 (0.09)	-17.75 (0.11)
	+13 02 38.01512	+05 11 8.10896	30.36 mas	-58.6 mas	310.357435	67.895776		3	B	RT Vir					35.54 (0.15)	-18.21 (0.17)
	+13 02 38.0158407	+05 11 8.1281	41.17 mas	-39.46 mas	310.357444	67.895781		4	C	RT Vir					39.95 (0.21)	-21.79 (0.24)

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 'ZHA17' 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 'ZHA17' AND detected=true AND hide=false ORDER BY detected DESC,id

Display data from paper

ZHA17 - VLBA Trigonometric Parallax Measurement of the Semi-regular Variable RT Vir

Interferometry data

View as list of objects

Detection table from Zhang et al. (2017)