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The pulsating hot subdwarf Balloon 090100001: results of the 2005 multisite campaign
Baran, A.1,2; Oreiro, R.3,4; Pigulski, A.5; Hernandez, F. Perez3,6; Ulla, A.7; Reed, M. D.8; Rodriguez-Lopez, C.7,9,10; Moskalik, P.11; Kim, S-L.12; Chen, W-P.13; Crowe, R.14; Siwak, M.15; Armendarez, L.14; Binder, P. M.14; Choo, K-J.12; Dye, A.14; Eggen, J. R.8; Garrido, R.9; Gonzalez Perez, J. M.3,16; Harms, S. L.8; Huang, F-Y.13; Koziel, D.15; Lee, H-T.13; MacDonald, J.17; Fox Machado, L.3,18; Monserrat, T.3; Stevick, J.14; Stewart, S.14; Terry, D.14; Zhou, A-Y.8,19; Zola, S.1,15
AbstractWe 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.
KeywordStars: Individual: Balloon 090100001 Stars: Oscillations Subdwarf
Indexed BySCI
WOS IDWOS:000262479100014
Citation statistics
Cited Times:27[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Affiliation1.Cracow Pedag Univ, PL-30084 Krakow, Poland
2.Torun Ctr Astron, Torun, Poland
3.Inst Astrofis Canarias, E-38200 San Cristobal la Laguna, Spain
4.Katholieke Univ Leuven, Inst Astron, B-3001 Leuven, Belgium
5.Univ Wroclaw, Inst Astron, PL-51622 Wroclaw, Poland
6.Univ La Laguna, Dpto Astrofis, San Cristobal la Laguna 38200, Spain
7.Univ Vigo, Dpto Fis Aplicada, Vigo 36200, Spain
8.Missouri State Univ, Dept Phys Astron & Mat Sci, Springfield, MO 65897 USA
9.CSIC, Inst Astrofis Andalucia, E-18008 Granada, Spain
10.Univ Toulouse, CNRS, Lab Astrophys Toulouse Tarbes, F-31400 Toulouse, France
11.Copernicus Astron Ctr, PL-00716 Warsaw, Poland
12.Korea Astron & Space Sci Inst, Taejon 305348, South Korea
13.Natl Cent Univ, Inst Astron, Chungli 32054, Taiwan
14.Univ Hawaii, Dept Phys & Astron, Hilo, HI 96720 USA
15.Jagiellonian Univ, PL-30244 Krakow, Poland
16.Grantecan SA CALP, Brena Baja 38712, La Palma, Spain
17.Univ Delaware, Dept Phys & Astron, Newark, DE 19716 USA
18.Univ Nacl Autonoma Mexico, Inst Astron, Observ Astron Nacl, Ensenada 22860, Baja California, Mexico
19.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China
Recommended Citation
GB/T 7714
Baran, A.,Oreiro, R.,Pigulski, 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 Baran, A..,Oreiro, R..,Pigulski, A..,Hernandez, F. Perez.,Ulla, A..,...&Zola, S..(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 Baran, A.,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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