A Couple of Kepler Eclipsers and a BY Draconis Star

J. Greaves
Northants, UK

Received:   18.02.2010;   accepted:   19.02.2010
(E-mail for contact: knot@safe-mail.net)

Comments:


2. MinII amplitude (0.04). Wrongly classed as a pulsating variable of 0.267626 day period in Pigulski et al. (2008).

3. Optical and NIR colours point towards this star being a red dwarf (Bessell and Brett 1988).

Remarks:
Searching within public Kepler Exoplanet Mission (http://kepler.nasa.gov) data (e.g. Koch et al. 2010) sourced via the MAST archive server (http://archive.stsci.edu/kepler/data_search/search.php) led to these two eclipsing binary and one rotational variables.

There being stated no intent within the mission to photometrically calibrate the Kepler flux values, an instrumental amplitude is derived in a magnitude scale derived from the flux, and the analyses and phaseplots presented here are based upon a differential magnitude scaled to the median flux value for each dataset. The stars' quoted Kepler magnitudes are given for the maximum magnitude and the aforementioned amplitude quoted for the minimum.

Acknowledgements: This research uses publically available data from the NASA Strategic Mission KEPLER. Kepler data presented in this paper were obtained from the Multimission Archive at the Space Telescope Science Institute (MAST). STScI is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS5-26555. Support for MAST for non-HST data is provided by the NASA Office of Space Science via grant NNX09AF08G and by other grants and contracts.

The SIMBAD and VizieR bibliographic and catalogue servers of the CDS, Strasbourg, where used during this research.

Patrick Wils and Sebastian Otero are acknowledged for giving "spotty" advice for the eclipsers.

The PZP Editors, Drs Antipin and Samus, are acknowledged for refining two of the periods.

References:
Bessell, M.S., Brett, J.M., 1988, PASP, 100, 1134
Koch, D.G., Borucki, W.J., Basri, G., et al., 2010, arXiv:1001.0268v1
Pigulski, A., Pojmanski, G., Pilecki, B., Szczygiel, D., 2008, arXiv:0808.2558v2