| dc.creator | Mennickent, R. E. | |
| dc.creator | Cidale, Lydia Sonia | |
| dc.creator | Pietrzyński, G. | |
| dc.creator | Gieren, W. | |
| dc.creator | Sabogal, B. | |
| dc.date | 2006-08-05 | |
| dc.date | 2019-10-15T14:46:56Z | |
| dc.identifier | http://sedici.unlp.edu.ar/handle/10915/83261 | |
| dc.identifier | issn: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.description | Facultad de Ciencias Astronómicas y Geofísicas | |
| dc.format | application/pdf | |
| dc.format | 949-961 | |
| dc.language | en | |
| dc.rights | http://creativecommons.org/licenses/by-nc-sa/4.0/ | |
| dc.rights | Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0) | |
| dc.subject | Ciencias Astronómicas | |
| dc.subject | Stars: binaries: eclipsing | |
| dc.subject | Stars: binaries: general | |
| dc.subject | Stars: circumstellar matter | |
| dc.subject | Stars: early type | |
| dc.subject | Stars: emission-line, Be | |
| dc.subject | Stars: mass-loss | |
| dc.title | Blue and yellow long-period variables in the direction of the Small Magellanic Cloud | |
| dc.type | Articulo | |
| dc.type | Articulo | |
