Blue and yellow long-period variables in the direction of the Small Magellanic Cloud
<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 s...
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| Autores principales: | , , , , |
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| Formato: | Articulo |
| Lenguaje: | Inglés |
| Publicado: |
2006
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| Acceso en línea: | http://sedici.unlp.edu.ar/handle/10915/83261 |
| Aporte de: |
| id |
I19-R120-10915-83261 |
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| record_format |
dspace |
| institution |
Universidad Nacional de La Plata |
| institution_str |
I-19 |
| repository_str |
R-120 |
| collection |
SEDICI (UNLP) |
| language |
Inglés |
| topic |
Ciencias Astronómicas Stars: binaries: eclipsing Stars: binaries: general Stars: circumstellar matter Stars: early type Stars: emission-line, Be Stars: mass-loss |
| spellingShingle |
Ciencias Astronómicas Stars: binaries: eclipsing Stars: binaries: general Stars: circumstellar matter Stars: early type Stars: emission-line, Be Stars: mass-loss Mennickent, R. E. Cidale, Lydia Sonia Pietrzyński, G. Gieren, W. Sabogal, B. Blue and yellow long-period variables in the direction of the Small Magellanic Cloud |
| topic_facet |
Ciencias Astronómicas Stars: binaries: eclipsing Stars: binaries: general Stars: circumstellar matter Stars: early type Stars: emission-line, Be Stars: mass-loss |
| 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. |
| format |
Articulo Articulo |
| author |
Mennickent, R. E. Cidale, Lydia Sonia Pietrzyński, G. Gieren, W. Sabogal, B. |
| author_facet |
Mennickent, R. E. Cidale, Lydia Sonia Pietrzyński, G. Gieren, W. Sabogal, B. |
| author_sort |
Mennickent, R. E. |
| title |
Blue and yellow long-period variables in the direction of the Small Magellanic Cloud |
| title_short |
Blue and yellow long-period variables in the direction of the Small Magellanic Cloud |
| title_full |
Blue and yellow long-period variables in the direction of the Small Magellanic Cloud |
| title_fullStr |
Blue and yellow long-period variables in the direction of the Small Magellanic Cloud |
| title_full_unstemmed |
Blue and yellow long-period variables in the direction of the Small Magellanic Cloud |
| title_sort |
blue and yellow long-period variables in the direction of the small magellanic cloud |
| publishDate |
2006 |
| url |
http://sedici.unlp.edu.ar/handle/10915/83261 |
| work_keys_str_mv |
AT mennickentre blueandyellowlongperiodvariablesinthedirectionofthesmallmagellaniccloud AT cidalelydiasonia blueandyellowlongperiodvariablesinthedirectionofthesmallmagellaniccloud AT pietrzynskig blueandyellowlongperiodvariablesinthedirectionofthesmallmagellaniccloud AT gierenw blueandyellowlongperiodvariablesinthedirectionofthesmallmagellaniccloud AT sabogalb blueandyellowlongperiodvariablesinthedirectionofthesmallmagellaniccloud |
| bdutipo_str |
Repositorios |
| _version_ |
1764820488441298946 |