The pulsating hot subdwarf Balloon 090100001: results of the 2005 multisite campaign
文献类型：期刊论文
| 作者 | Harms, S. L.1; Reed, M. D.1; Ulla, A.12; Hernandez, F. Perez16,19; Pigulski, A.18; Oreiro, R.16,17; Baran, A.14,15; Eggen, J. R.1; Dye, A.10; Choo, K-J.5 |
| 刊名 | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
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| 出版日期 | 2009-01-21 |
| 卷号 | 392期号:3页码:1092-1105 |
| 关键词 | Stars: Individual: Balloon 090100001 Stars: Oscillations Subdwarf |
| DOI | 10.1111/j.1365-2966.2008.14024.x |
| 英文摘要 | We present the results of a multisite photometric campaign on the pulsating B-type hot subdwarf star Balloon 090100001 (Bal09). The star is one of the two known hybrid hot subdwarfs with both long-and short-period oscillations, theoretically attributed to g and p modes. The campaign involved eight telescopes with three obtaining UBVR data, four B-band data and one Stromgren uvby photometry. The campaign covered 48 nights, providing a temporal resolution of 0.36 mu Hz with a detection threshold of about 0.2 mmag in B-filter data. Bal09 has the richest pulsation spectrum of any known pulsating subdwarf B star, and our analysis detected 114 frequencies including 97 independent and 17 combination ones. Most of the 24 g-mode frequencies are between 0.1 and 0.4 mHz. Of the remaining 73, presumably p modes, 72 group into four distinct regions near 2.8, 3.8, 4.7 and 5.5 mHz. The density of frequencies requires that some modes must have degrees l larger than 2. The modes in the 2.8 mHz region have the largest amplitudes. The strongest mode (f(1)) is most likely radial, while the remaining ones in this region form two nearly symmetric multiplets: a triplet and quintuplet, attributed to rotationally split l = 1 and 2 modes, respectively. We find clear increases of splitting in both multiplets between the 2004 and 2005 observing campaigns, amounting to similar to 15 per cent on average. The observed splittings imply that the rotational rate in Bal09 depends on stellar latitude and is the fastest on the equator. We also speculate on the possible reasons for the changes of splitting. The only plausible explanation we find is torsional oscillation. This hypothesis, however, needs to be verified in the future by detailed modelling. In this context, it is very important to monitor the splittings on a longer time-scale as their behaviour may help to explain this interesting phenomenon. |
| 语种 | 英语 |
| WOS记录号 | WOS:000262479100014 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/8982]  |
| 专题 | 国家天文台_射电天文研究部 |
| 作者单位 | 1.Missouri State Univ, Dept Phys Astron & Mat Sci, Springfield, MO 65897 USA 2.CSIC, Inst Astrofis Andalucia, E-18008 Granada, Spain 3.Univ Toulouse, CNRS, Lab Astrophys Toulouse Tarbes, F-31400 Toulouse, France 4.Copernicus Astron Ctr, PL-00716 Warsaw, Poland 5.Korea Astron & Space Sci Inst, Taejon 305348, South Korea 6.Univ Nacl Autonoma Mexico, Inst Astron, Observ Astron Nacl, Ensenada 22860, Baja California, Mexico 7.Univ Delaware, Dept Phys & Astron, Newark, DE 19716 USA 8.Grantecan SA CALP, Brena Baja 38712, La Palma, Spain 9.Jagiellonian Univ, PL-30244 Krakow, Poland 10.Univ Hawaii, Dept Phys & Astron, Hilo, HI 96720 USA |
| 推荐引用方式 GB/T 7714 | Harms, S. L.,Reed, M. D.,Ulla, A.,et al. The pulsating hot subdwarf Balloon 090100001: results of the 2005 multisite campaign[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2009,392(3):1092-1105. |
| APA | Harms, S. L..,Reed, M. D..,Ulla, A..,Hernandez, F. Perez.,Pigulski, A..,...&Garrido, R..(2009).The pulsating hot subdwarf Balloon 090100001: results of the 2005 multisite campaign.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,392(3),1092-1105. |
| MLA | Harms, S. L.,et al."The pulsating hot subdwarf Balloon 090100001: results of the 2005 multisite campaign".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 392.3(2009):1092-1105. |
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来源：国家天文台
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