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LEK10 - Pulsations of the water-vapor maser in NGC 7538 IRS 1 with a period of about 0.9 year

Short title: Lekht & Munitsyn (2010)
Authors: Lekht, E. E.Munitsyn, V. A.
Journal: Astronomy Reports, Volume 54, Issue 2, pp.151-155
Bibcode:

Target type: High_mass_SFR

Abstract
We report the results of a study of fast variations of the H₂O maser emission toward NGC 7538 IRS 1, which is associated with a star-forming region. The study is based on monitoring data in the 1.35 cm line obtained in 1996-2003 on the 22-meter radio telescope of the Pushchino Radio Astronomy Observatory (Russia). Periodic flux variations of four long-lived emission features with an average period of about 0.9 year have been detected. The flux variations of these features are correlated, suggesting that the detected variability is a consequence of pulsation of, e.g., stellar wind from the protostar in NGC 7538 IRS 1, with a period of about 0.9 year (0.87 ± 0.03 year). These pulsations are superimposed on long-term variability of the integrated maser emission with a period of 13 years.

Abstract

We report the results of a study of fast variations of the H₂O maser emission toward NGC 7538 IRS 1, which is associated with a star-forming region. The study is based on monitoring data in the 1.35 cm line obtained in 1996-2003 on the 22-meter radio telescope of the Pushchino Radio Astronomy Observatory (Russia). Periodic flux variations of four long-lived emission features with an average period of about 0.9 year have been detected. The flux variations of these features are correlated, suggesting that the detected variability is a consequence of pulsation of, e.g., stellar wind from the protostar in NGC 7538 IRS 1, with a period of about 0.9 year (0.87 ± 0.03 year). These pulsations are superimposed on long-term variability of the integrated maser emission with a period of 13 years.

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Detection table from Lekht & Munitsyn (2010)

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ID	Obs. RA	Obs. Dec	l	b	Group id	Source name	Image	Descr.	Line	F_peak	Telescope	V_step	Beam	Detection	Class	Dist. (parallax)	Date
	(J2000)	(J2000)	(deg.)	(deg.)					H₂O	(Jy)		(km/s)	(arcsec)	Yes/No		(kpc)
1	23 13 45.2	+61 28 9.7	111.5418	0.7768	G111.542+0.769	NGC 7538 IRS 1	Image	Descr	22 GHz;	230	RT22_PRAO	0.101	156	+H₂O +CH₃OH I +CH₃OH II +OH	SFR		1996-2003

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 'LEK10' 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 'LEK10' AND detected=true AND hide=false ORDER BY detected DESC,id

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LEK10 - Pulsations of the water-vapor maser in NGC 7538 IRS 1 with a period of about 0.9 year

View as list of objects

Detection table from Lekht & Munitsyn (2010)