ODI Monitoring of the Local Group Spirals

Type Conference Paper
Names Marina Orio, T. Nelson, R. K. Honeycutt
Proceedings Title Bulletin of the American Astronomical Society
Conference Name American Astronomical Society AAS Meeting #214, #410.03
Volume 41
Pages 675
Date May 1, 2009
URL http://adsabs.harvard.edu/abs/2009AAS...21441003O
Library Catalog NASA ADS
Abstract The ODI on WIYN will allow a revolution in studies of extragalactic novae and X-ray binaries. We plan to monitor M31 and M33 twice a month using both narrow and broad band filters. With 6 pointings of M33 we will reach even very peripheral regions of the galaxy. H(alpha) imaging will allow us to follow the light curves of classical and recurrent novae as long as they fall by 6-7 magnitudes. We have started a successful program of spectroscopic monitoring of M31 novae at the TNG telescope and we foresee that the couplig of long term light curves and spectra will allow us to classify the novae and obtain accurate nova rates in different regions of the galaxy, answering questions like: - Is the nova rate per unit of luminous stellar mass really quite different in M31, in M33 and the Galaxy? - Are novae mainly associated with the bulge and old populations, or is there a younger component like seems to be present in the Magellanic Clouds? Another exciting program concerns X-ray binaries. By now, close to a thousand X-ray sources have been observed in M31, and more than 400 in M33. With a combination of narrow and broad band images we will be able to identify possible optical counterparts of many of these sources and follow their variability at optical wavelenghts, to put together the puzzle necessary for source identification and classification. We will show how this is particularly interesting for some supersoft X-ray sources that seem to be associated with high mass X-ray binaries, explaining the star formation rate depending component in type Ia supernovae.
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