| dc.creator | OLIVEIRA, R. Lopes de | |
| dc.creator | MOTCH, C. | |
| dc.date.accessioned | 2012-04-19T15:38:10Z | |
| dc.date.accessioned | 2018-07-04T14:43:02Z | |
| dc.date.available | 2012-04-19T15:38:10Z | |
| dc.date.available | 2018-07-04T14:43:02Z | |
| dc.date.created | 2012-04-19T15:38:10Z | |
| dc.date.issued | 2011 | |
| dc.identifier | ASTROPHYSICAL JOURNAL LETTERS, v.731, n.1, 2011 | |
| dc.identifier | 2041-8205 | |
| dc.identifier | http://producao.usp.br/handle/BDPI/16639 | |
| dc.identifier | 10.1088/2041-8205/731/1/L6 | |
| dc.identifier | http://dx.doi.org/10.1088/2041-8205/731/1/L6 | |
| dc.identifier.uri | http://repositorioslatinoamericanos.uchile.cl/handle/2250/1613460 | |
| dc.description.abstract | We report the discovery with XMM-Newton of a hard-thermal (T similar to 130 MK) and variable X-ray emission from the Be star HD 157832, a new member of the puzzling class of gamma-Cas-like Be/X-ray systems. Recent optical spectroscopy reveals the presence of a large/dense circumstellar disk seen at intermediate/high inclination. With a B1.5V spectral type, HD 157832 is the coolest gamma-Cas analog known. In addition, its non-detection in the ROSAT all-sky survey shows that its average soft X-ray luminosity varied by a factor larger than similar to 3 over a time interval of 14 yr. These two remarkable features, ""low"" effective temperature, and likely high X-ray variability turn HD 157832 into a promising object for understanding the origin of the unusually high-temperature X-ray emission in these systems. | |
| dc.language | eng | |
| dc.publisher | IOP PUBLISHING LTD | |
| dc.relation | Astrophysical Journal Letters | |
| dc.rights | Copyright IOP PUBLISHING LTD | |
| dc.rights | closedAccess | |
| dc.subject | stars: emission-line, Be | |
| dc.subject | stars: individual (HD 157832) | |
| dc.subject | X-rays: stars | |
| dc.title | A HARD AND VARIABLE X-RAY EMISSION FROM THE MASSIVE EMISSION-LINE STAR HD 157832 | |
| dc.type | Artículos de revistas | |
