NAOC Open IR  > 光学天文研究部
A Whole Earth Telescope campaign on the pulsating subdwarf B binary system PG 1336-018 (NY Vir)
Kilkenny, D; Reed, MD; O'Donoghue, D; Kawaler, SD; Mukadam, A; Kleinman, SJ; Nitta, A; Metcalfe, TS; Provencal, JL; Watson, TK; Sullivan, DJ; Sullivan, T; Shobbrook, R; Jiang, XJ; Joshi, S; Ashoka, BN; Seetha, S; Leibowitz, E; Ibbetson, P; Mendelson, H; Meistas, E; Kalytis, R; Alisauskas, D; Martinez, P; van Wyk, F; Stobie, RS; Marang, F; Zola, S; Krzesinski, J; Ogloza, W; Moskalik, P; Silvotti, R; Piccioni, A; Vauclair, G; Dolez, N; Chevreton, M; Dreizler, S; Schuh, SL; Deetjen, JL; Solheim, JE; Perez, JMG; Ulla, A; Ostensen, R; Manteiga, M; Suarez, O; Burleigh, M; Kepler, SO; Kanaan, A; Giovannini, O
AbstractWe present results from a multisite ('Whole Earth Telescope') photometric campaign on PG 1336-018, the close eclipsing binary system containing a pulsating subdwarf B (sdB) star. The main part of the campaign (1999 April) resulted in similar to172 h of observations, representing a coverage of about 47 per cent, and additional data were obtained outside the core campaign. Periodogram analysis shows that the light variations are dominated by three frequencies near 5757, 5585 and 5369 muHz (similar to174, 179 and 186 s, respectively), although many frequencies are present, particularly in the range 5000-6000 muHz (similar to200-170 s). We identify, with some confidence, 28 frequencies down to a semi-amplitude of 0.0005 in fractional intensity (equivalent to about 0.5 mmag). It is clear that the pulsation frequencies of PG 1336-018 have changed substantially since the 1996 discovery observations were made, and that amplitude changes occur, at least in the dominant three frequencies, on relatively short time-scales (of the order of a day). On the assumption that the pulsating star is phase-locked in the binary system, we have searched for rotational splitting of frequencies near the orbital and half of the orbital period, but the results are confused by aliasing at those frequencies (due to the data gaps caused by the eclipses). A preliminary model qualitatively matches the distribution of frequencies in PG 1336-018, with some good individual correspondences, but cannot be considered adequate because geometric cancellation should hide some of the modes which are apparently detected. Analysis of the pulsations during eclipse recovers three of the strongest modes, but the limited eclipse data - which can, at best, be only about 9 per cent of the total - do not allow mode identification at this stage. Simulations indicate that an overall coverage of about 80 per cent would be required for this to be viable. An attempt was made to determine phase shifts in the pulsation frequencies as a way of directly measuring the size of the binary orbit, but the uncertainties in the method are comparable to the light travel time across the orbit (probably less than a second).
KeywordStars : Individual : Pg 1336-018 Stars : Oscillations Stars : Variables : Other
Indexed BySCI
WOS IDWOS:000186168600015
Citation statistics
Document Type期刊论文
Affiliation1.S African Astron Observ, ZA-7935 Observatory, South Africa
2.SW Missouri State Univ, Dept Phys Astron & Mat Sci, Springfield, MO 65804 USA
3.Iowa State Univ, Dept Phys & Astron, Ames, IA 50011 USA
4.Univ Texas, Dept Astron, Austin, TX 78712 USA
5.Apache Point Observ, Sunspot, NM 88349 USA
6.Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA
7.Univ Delaware, Newark, DE 19716 USA
8.Southwestern Univ, Georgetown, TX 78626 USA
9.Victoria Univ Wellington, Sch Chem & Phys Sci, Wellington, New Zealand
10.Univ Sydney, Sch Phys, Chatterton Astron Dept, Sydney, NSW 2006, Australia
11.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China
12.Uttar Pradesh State Observ, Naini Tal 263129, India
13.Indian Space Res Org, Bangalore 560017, Karnataka, India
14.Tel Aviv Univ, Wise Observ, IL-69978 Tel Aviv, Israel
15.Inst Theoret Phys & Astrophys, LT-2600 Vilnius, Lithuania
16.Vilnius State Univ, Inst Mat Res & Appl Sci, LT-2009 Vilnius, Lithuania
17.Jagiellonian Univ, Astron Observ, PL-30244 Krakow, Poland
18.Krakow Pedag Univ, Mt Suhora Observ, Krakow, Poland
19.Nicholas Copernicus Astron Ctr, PL-00716 Warsaw, Poland
20.Osserv Astron Capodimonte, I-80131 Naples, Italy
21.Univ Bologna, Dipartimento Astron, I-40127 Bologna, Italy
22.Univ Toulouse 3, Observ Midi Pyrenees, CNRS, UMR5572, F-31400 Toulouse, France
23.Observ Paris, DAEC, F-92195 Meudon, France
24.Univ Tubingen, Inst Astron & Astrophys, D-72076 Tubingen, Germany
25.Univ Tromso, Inst Fys, N-9037 Tromso, Norway
26.Univ Vigo, Fac Ciencias, Dept Fis, Vigo 36200, Spain
27.Isaac Newton Grp Telescopes, E-37800 Santa Cruz de La Palma, Spain
28.Civil Univ A Coruna, Dept Ciencias Navegac & Tierra ES Marina, E-15011 Acoruna, Spain
29.Univ Leicester, Dept Phys & Astron, Leicester LE1 7RH, Leics, England
30.Univ Fed Rio Grande do Sul, Inst Fis, BR-91501900 Porto Alegre, RS, Brazil
31.Univ Fed Santa Catarina, Florianopolis, SC, Brazil
32.Univ Caixas do Sul, Dept Quim & Fis, BR-95001970 Caxias do Sul, RS, Brazil
Recommended Citation
GB/T 7714
Kilkenny, D,Reed, MD,O'Donoghue, D,et al. A Whole Earth Telescope campaign on the pulsating subdwarf B binary system PG 1336-018 (NY Vir)[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2003,345(3):834-846.
APA Kilkenny, D.,Reed, MD.,O'Donoghue, D.,Kawaler, SD.,Mukadam, A.,...&Giovannini, O.(2003).A Whole Earth Telescope campaign on the pulsating subdwarf B binary system PG 1336-018 (NY Vir).MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,345(3),834-846.
MLA Kilkenny, D,et al."A Whole Earth Telescope campaign on the pulsating subdwarf B binary system PG 1336-018 (NY Vir)".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 345.3(2003):834-846.
Files in This Item:
There are no files associated with this item.
Related Services
Recommend this item
Usage statistics
Export to Endnote
Google Scholar
Similar articles in Google Scholar
[Kilkenny, D]'s Articles
[Reed, MD]'s Articles
[O'Donoghue, D]'s Articles
Baidu academic
Similar articles in Baidu academic
[Kilkenny, D]'s Articles
[Reed, MD]'s Articles
[O'Donoghue, D]'s Articles
Bing Scholar
Similar articles in Bing Scholar
[Kilkenny, D]'s Articles
[Reed, MD]'s Articles
[O'Donoghue, D]'s Articles
Terms of Use
No data!
Social Bookmark/Share
All comments (0)
No comment.

Items in the repository are protected by copyright, with all rights reserved, unless otherwise indicated.