dc.creatorMennickent, R. E.
dc.creatorCidale, Lydia Sonia
dc.creatorPietrzyński, G.
dc.creatorGieren, W.
dc.creatorSabogal, B.
dc.date2006-08-05
dc.date2019-10-15T14:46:56Z
dc.identifierhttp://sedici.unlp.edu.ar/handle/10915/83261
dc.identifierissn:0004-6361
dc.description<b>Aims.</b> We investigate the nature of a sample of 17 long-term periodic variables in the direction of the Small Magellanic Cloud. <b>Methods.</b> 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. <b>Results.</b> 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.
dc.descriptionFacultad de Ciencias Astronómicas y Geofísicas
dc.formatapplication/pdf
dc.format949-961
dc.languageen
dc.rightshttp://creativecommons.org/licenses/by-nc-sa/4.0/
dc.rightsCreative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)
dc.subjectCiencias Astronómicas
dc.subjectStars: binaries: eclipsing
dc.subjectStars: binaries: general
dc.subjectStars: circumstellar matter
dc.subjectStars: early type
dc.subjectStars: emission-line, Be
dc.subjectStars: mass-loss
dc.titleBlue and yellow long-period variables in the direction of the Small Magellanic Cloud
dc.typeArticulo
dc.typeArticulo


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