Near-infrared variability study of the central 2.3 arcmin × 2.3 arcmin of the Galactic Centre - I. Catalogue of variable sources

DOI: 
10.1093/mnras/stx1436
Publication date: 
01/09/2017
Main author: 
Dong, Hui
IAA authors: 
Dong, Hui;Schödel, Rainer;Nogueras-Lara, Francisco;Gallego-Cano, Eulalia;Gallego-Calvente, Teresa
Authors: 
Dong, Hui;Schödel, Rainer;Williams, Benjamin F.;Nogueras-Lara, Francisco;Gallego-Cano, Eulalia;Gallego-Calvente, Teresa;Wang, Q. Daniel;Morris, Mark R.;Do, Tuan;Ghez, Andrea
Journal: 
Monthly Notices of the Royal Astronomical Society
Refereed: 
Yes
Publication type: 
Article
Volume: 
470
Pages: 
3427-3452
Abstract: 

We used 4-yr baseline Hubble Space Telescope/Wide Field Camera 3 IR observations of the Galactic Centre in the F153M band (1.53 μm) to identify variable stars in the central ∼2.3 arcmin × 2.3 arcmin field. We classified 3845 long-term (periods from months to years) and 76 short-term (periods of a few days or less) variables among a total sample of 33 070 stars. For 36 of the latter ones, we also derived their periods (〈3 d). Our catalogue not only confirms bright long period variables and massive eclipsing binaries identified in previous works but also contains many newly recognized dim variable stars. For example, we found δ Scuti and RR Lyrae stars towards the Galactic Centre for the first time, as well as one BL Her star (period 〈 1.3 d). We cross-correlated our catalogue with previous spectroscopic studies and found that 319 variables have well-defined stellar types, such as Wolf-Rayet, OB main sequence, supergiants and asymptotic giant branch stars. We used colours and magnitudes to infer the probable variable types for those stars without accurately measured periods or spectroscopic information. We conclude that the majority of unclassified variables could potentially be eclipsing/ellipsoidal binaries and Type II Cepheids. Our source catalogue will be valuable for future studies aimed at constraining the distance, star formation history and massive binary fraction of the Milky Way nuclear star cluster.

Database: 
ADS
SCOPUS
URL: 
https://www.scopus.com/inward/record.uri?eid=2-s2.0-85037134988&doi=10.1093%2fmnras%2fstx1436&partnerID=40&md5=a3d474949ea17405dfdef1d31fcc9a3d
ADS Bibcode: 
2017MNRAS.470.3427D
Keywords: 
stars: variables: general - Galaxy: centre;infrared: stars;Astrophysics - Astrophysics of Galaxies