New Massive Contact Twin Binary in a Radio-quiet HII Region Associated with the M17 Complex

Abstract

Early-B stars may create an HII region that appears as radio-quiet. We report the identification of new early-B stars associated with the radio-quiet HII region G014.645--00.606 in the M17 complex. The ratio-quiet HII region G014.645--00.606 is adjacent to three radio-quiet WISE HII region candidates. The ionizing sources of the radio-quiet HII regions are expected to later than B1V, given the sensitivity about 1-2 mJy of the MAGPIS 20 cm survey. The stars were first selected if their parallaxes of GAIA EDR3 match that of the 22 GHz H${}_2$O maser source within the same region. We used the color-magnitude diagram made from the ZTF photometric catalog to select the candidates for massive stars because the intrinsic $g-r$ colors of massive stars change little from B-type to O-type stars. Five stars lie in the areas of the color-magnitude diagram where either reddened massive stars or evolved post-main sequence stars of lower masses are commonly found. Three of the five stars, sources 1, 2, and 3, are located at the cavities of the three IR bubbles, and extended H$\alpha$ emission is detected around the three IR bubbles. We suggest that sources 1, 2, and 3 are candidates for early-B stars associated with the radio-quiet region G014.645--00.606. Particularly, source 1 is an EW type eclipsing binary with a short period of 0.825 day, while source 2 is an EA type eclipsing binary with a short period of 0.919 day. The physical parameters of the two binary systems have been derived through the PHOEBE model. Source 1 is a twin binary of two stars with T~23,500 K, and source 2 contains a hotter component (T~20,100 K) and a cooler one (T~15,500 K). The $O-C$ values of source 1 show a trend of decline, implying that the period of the source is deceasing. Source 1 is likely a contacting early-B twin binary, for which mass transfer might cause its orbit to shrink.

published by RAA in 2022 March 10

References in corpus (27)

• Binary interaction dominates the evolution of massive stars
• The Zwicky Transient Facility: System Overview, Performance, and First Results
• The Zwicky Transient Facility: Data Processing, Products, and Archive
• Trigonometric Parallaxes Of High-Mass Star Forming Regions: Our View Of The Milky Way
• The Optical to Mid-Infrared Extinction Law Based on the APOGEE, Gaia DR2, Pan-STARRS1, SDSS, APASS, 2MASS and WISE Surveys
• The VLA Galactic Plane Survey
• Physics Of Eclipsing Binaries. II. Towards the Increased Model Fidelity
• Toward Complete Statistics of Massive Binary Stars: Penultimate Results from the Cygnus OB2 Radial Velocity Survey
• The VST Photometric Halpha Survey of the Southern Galactic Plane and Bulge (VPHAS+)
• Constraining the thermally-pulsing asymptotic giant branch phase with resolved stellar populations in the Small Magellanic Cloud
• Trigonometric parallaxes of star forming regions in the Sagittarius spiral arm
• Magnetohydronamic Evolution of HII Regions in Molecular Clouds: Simulation Methodology, Tests, and Uniform Media
• A Catalogue of OB Stars from LAMOST Spectroscopic Survey
• The Galactic spiral structure as revealed by O- and early B-type stars
• An all-sky sample of intermediate- to high-mass OBA-type eclipsing binaries observed by TESS
• The Milky Way Project Second Data Release: Bubbles and Bow Shocks
• The deep OB star population in Carina from the VST Photometric H$\alpha$ Survey (VPHAS+)
• A beta Cephei pulsator and a changing orbital inclination in the high-mass eclipsing binary system VV Orionis
• Surveying the Giant HII Regions of the Milky Way with SOFIA: II. M17
• The Morphology of M17-UC1 - A Disk Candidate Surrounding a Hypercompact HII Region
• The Milky Way Project: What are Yellowballs?
• Variability of young stellar objects in the star-forming region Pelican Nebula
• A Survey for High-Mass Eclipsing Binaries
• VLT near- to mid-IR imaging and spectroscopy of the M17 UC1-IRS5 region
• SOFIA {\it FORCAST} Photometry of 12 Extended Green Objects in the Milky Way
• Variable Stars in Young Open Cluster NGC 2244
• Census of Variable Stars toward Serpens Main

Cited by in corpus (1)

• Gamma-ray observation towards the young massive star cluster NGC 6618 in the M17 region