Detection of Stellar Variability in the Central Parsec of the Galaxy

Details Detection of Stellar Variability in the Central Parsec of the Galaxy Detection of Stellar Variability in the Central Parsec of the Galaxy

Aug 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996apj...467..645t&link_type=abstract

Astrophysical Journal v.467, p.645

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14

Galaxy: Center, Infrared: Stars, Stars: Variables: Other

Scientific paper

We have searched for time variability of the stars in the central parsec of the Galaxy through K-band (2.2 μm) imaging and photometry. The observations were made with an array-based camera at the NASA Infrared Telescope Facility in 1991, 1992, and 1993. In 1991, on timescales ranging from 20 s to a week, no time variability greater than 0.1 mag was found for about five dozen sources in this region, and the brighter sources were stable to 0.05 mag. On timescales of 1-2 yr, we found a new source near IRS 1OE that varied in brightness by at least 1 mag and detected variability of ˜0.15 to 0.5 mag in several other sources, most notably the red giants IRS 9 and IRS 12N. None of the luminous blue stars identified in the Galactic center region shows evidence for variability.

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