Photometric Analysis of a Rare, EB Extreme Mass Ratio Binary, V409 Hydrae

Details Photometric Analysis of a Rare, EB Extreme Mass Ratio Binary, V409 Hydrae Photometric Analysis of a Rare, EB Extreme Mass Ratio Binary, V409 Hydrae

Jan 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21341005l&link_type=abstract

American Astronomical Society, AAS Meeting #213, #410.05; Bulletin of the American Astronomical Society, Vol. 41, p.212

Astronomy and Astrophysics

Astronomy

1

Scientific paper

We present a preliminary analysis of an EB Extreme Mass Ratio eclipsing binary, V409 Hydrae, based on observations taken at the National Undergraduate Research Observatory (NURO) and the Southeastern Association for Research in Astronomy (SARA) in fall 2007 and spring 2008. Light curves, a period study and a synthetic light curve solution are presented for this variable which was recently reclassified by ROTSE as an eclipsing binary (2006, IBVS 5699).
Our CCD observations of V409 Hya [NSV4399, GSC230 1604, S9609 Hya, α(2000) = 09h 10m 09.575s, δ(2000) = +03o 44’ 34.42"] were taken on 27-31 September, 2007 at Lowell Observatory with the 0.81-m reflector and 19 February, 12 and 15 March and 19 April, 2008 via remote observing from Kitt Peak. Standard UBVRcIc Johnson-Cousins filters were used.
V409 Hya may be considered an AW UMa-type system. Notably, it is an extreme mass ratio, high fill-out, contact binary with unequal eclipse depths. It cannot remain long in such a configuration. We suspect that spots are responsible for this apparently unusual state. The eclipse duration is 68 minutes, while the primary and secondary amplitudes are only 0.5 and 0.4 in V.
Mean times of eclipse were calculated: HJD Min I = 2454516.77135(±0.00128), 2454576.7524(±0.0027), HJD Min II = 2454466.9411(±0.0035), 2454517.0064(±0.0049), 2454538.7236(±0.0046). These, the epoch by ROTSE (2006, IBVS 5699) and the epoch calculated by the Wilson code, yielded the following ephemeris:
HJD Hel Min I =2451553.30685(±.0.00287)d + 0.4722649(±0.0000005)E.
Our unspotted Wilson code solution yielded a mass ratio of only 0.1991(±0.0005), an inclination of 89.2(±0.6)o, component temperatures of 6500 and 6279(±5) K, and a large fill-out of 63%. Other results of our photometric analyses will be presented.
We wish to thank NURO for observing time, as well as NASA and the American Astronomical Society for their support in paying for travel and publication expenses.

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