A Study of Stellar Photometric Variability Within the Central 4 pc of the Galactic Center with Infrared Image Subtraction

• Autorzy: Peeples, M. S. , Stanek, K. Z. , DePoy, D. L.
• Języki publikacji: EN

Abstrakty

EN

We present a catalog of 110 variable stars within ≈1' of Sgr A* based on image subtraction of near-infrared (H and K) photometry. Our images were obtained over 133 nights from 2000 to 2002 in H-band and over 134 nights from 2001 to 2002 in K-band; the typical FWHM is 1".4. We match the catalog to other near-infrared, X-ray, and radio (i.e., maser) data, and we discuss some of the more interesting objects. The catalog includes 14 sources with measurable periods, several known long-period variables and three new LPV candidates. We associate IRS 10* with OH, SiO, and H2O masers and a bright X-ray point source; this analysis suggests IRS 10* is an AGB star with an accreting companion. Among the ≈90 newly discovered sources are a probable cataclysmic variable, a potential edge-on contact 84 day period eclipsing binary, and a possible 41 day period pulsating variable.

Słowa kluczowe

EN

Galaxy: center; Stars: variables: general

• Czasopismo: Acta Astronomica
• Rocznik: 2007
• Tom: Vol. 57, No. 2
• Strony: 173--199
• Opis fizyczny: Bibliogr. 55 poz., rys., tab., wykr.

Twórcy

autor

Peeples, M. S.

• Department of Astronomy, Ohio State University, 140 W. 18th Ave., Columbus, OH43210, USA ,

autor

Stanek, K. Z.

• Department of Astronomy, Ohio State University, 140 W. 18th Ave., Columbus, OH43210, USA ,

autor

DePoy, D. L.

• Department of Astronomy, Ohio State University, 140 W. 18th Ave., Columbus, OH43210, USA ,

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