Blue and yellow long-period variables in the direction of the Small Magellanic Cloud

Details Blue and yellow long-period variables in the direction of the Small Magellanic Cloud Blue and yellow long-period variables in the direction of the Small Magellanic Cloud

Oct 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006a%26a...457..949m&link_type=abstract

Astronomy and Astrophysics, Volume 457, Issue 3, October III 2006, pp.949-961

Astronomy and Astrophysics

Astrophysics

8

Stars: Binaries: General, Stars: Binaries: Eclipsing, Stars: Early Type, Stars: Emission-Line, Be, Stars: Circumstellar Matter, Stars: Mass-Loss

Scientific paper

Aims.We investigate the nature of a sample of 17 long-term periodic variables in the direction of the Small Magellanic Cloud. Methods: .Based on new spectroscopic data, we determined spectral types, radial velocities, absolute magnitudes, and colors for these stars. We present a refined discussion of their OGLE light curves along with an analysis of their 2MASS photometry. Results: .Most stars turned out to be B-A giants members of the Small Magellanic Cloud. We find a new interacting eclipsing binary with a period of 184 days and two new early-type ellipsoidal variables. One of our objects is the ROSAT source RX J0058.2-7231. We analyzed 11-years of data for this Be X-ray binary finding that their photometric period varies by ~4% quasiperiodically, on a time scale of ~1200 days. We find evidence of multiple photometric periods in 2 Ae-type and 1 late-Be type stars. The case of OGLE00445466-7328029 is especially interesting, as this late-type Be star shows a beating phenomenon primarily caused by two closely-spaced frequencies, 0.05733 c/d (17.44 d) and 0.06347 c/d (15.76 d). Four other emission-line objects show stable long-term periodicities and probably correspond to Be-star binaries. Transient photometric periods are only found in 4 non-emission early-type stars.

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