The Delta Scuti star 38 Eri from the ground and from space

被引:7
作者
Paparo, M. [1 ]
Kollath, Z. [2 ]
Shobbrook, R. R. [3 ]
Matthews, J. M. [4 ]
Antoci, V. [5 ]
Benko, J. M. [1 ]
Park, N. -K. [6 ,7 ]
Mirtorabi, M. T. [8 ]
Luedeke, K. [9 ]
Kusakin, A. [10 ]
Bognar, Zs. [1 ]
Sodor, A. [1 ]
Garcia-Hernandez, A. [11 ]
Pena, J. H. [12 ]
Kuschnig, R. [13 ,14 ]
Moffat, A. F. J. [15 ,16 ]
Rowe, J. [17 ]
Rucinski, S. M. [18 ]
Sasselov, D. [19 ]
Weiss, W. W. [13 ]
机构
[1] Konkoly Observ Budapest, MTA CSFK, Konkoly Thege MU 15-17, H-1121 Budapest, Hungary
[2] Eotvos Lorand Univ, Savaria Dept Phys, Karolyi G Ter 4, H-9700 Szombathely, Hungary
[3] Australian Natl Univ, Siding Spring Observ, Coonabarabran, NSW 2137, Australia
[4] Univ British Columbia, Dept Phys & Astron, 6224 Agr Rd, Vancouver, BC V6T 1Z1, Canada
[5] Aarhus Univ, Stellar Astrophys Ctr, Dept Phys & Astron, 120 Ny Munkegade, DK-8000 Aarhus, Denmark
[6] Korea Astron & Space Sci Inst, 39-18 Hwaam Dong, Daejeon 34055, South Korea
[7] Avcorp Ind Inc, 10025 River Way, Delta, BC V4G 1M7, Canada
[8] Alzahra Univ, Dept Phys, POB 1993893973, Tehran, Iran
[9] 98100 Barstow St NE,Apt 6104, Albuquerque, NM 87122 USA
[10] Fesenkov Astrophys Inst, Observ 23, Alma Ata 050020, Kazakhstan
[11] Univ Granada UGR, Dept Theoret Phys & Cosmol, E-18071 Granada, Spain
[12] Univ Nacl Autonoma Mexico, Inst Astron, Apartado Postal 70-264, Mexico City 04510, DF, Mexico
[13] Univ Wien, Inst Astron, Turkenschans Str 17, A-1180 Vienna, Austria
[14] Graz Univ Technol, Inst Kommunikationsnetze & Satellitenkommun, Infeldgasse 12, A-8010 Graz, Austria
[15] Univ Montreal, Dept Phys, 15, CP. 6128,Succ Ctr Ville, Montreal, PQ H3C 3J7, Canada
[16] Univ Montreal, CRAQ, 15, CP. 6128,Succ Ctr Ville, Montreal, PQ H3C 3J7, Canada
[17] Canadian Coast Guard Coll, Dept Arts Sci & Languages, Sydney, NSW B1R 2J6, Australia
[18] Univ Toronto, Dept Astron & Astrophys, Toronto, ON M5S 3H4, Canada
[19] Univ Western Australia, Int Ctr Radio Astron Res, Australia 35 Stirling Hwy, Crawley, WA 6009, Australia
基金
加拿大自然科学与工程研究理事会;
关键词
space vehicles; techniques: photometric; stars: individual: 38 Eri; stars: interiors; stars: oscillations; Stars: variables: delta Scuti; NONRADIAL OSCILLATIONS; MODE-IDENTIFICATION; PETERSEN DIAGRAMS; UNEXPECTED SERIES; REGULAR PATTERNS; PULSATION; ROTATION; ASTEROSEISMOLOGY; COROT; PHOTOMETRY;
D O I
10.1093/mnras/sty885
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We present and discuss the pulsational characteristics of the Delta Scuti star 38 Eri from photometric data obtained at two widely spaced epochs, partly from the ground (1998) and partly from space (MOST, 2011). We found 18 frequencies resolving the discrepancy among the previously published frequencies. Some of the frequencies appeared with different relative amplitudes at two epochs, however, we carried out investigation for amplitude variability for only the MOST (Microvariability and Oscillation of STars) data. Amplitude variability was found for one of the three frequencies that satisfy the necessary frequency criteria for linear-combination or resonant-mode coupling. Checking the criteria of beating and resonant-mode coupling we excluded them as possible reason for amplitude variability. The two recently developed methods of rotational splitting and sequence search were applied to find regular spacings based only on frequencies. Doublets or incomplete multiplets with l = 1, 2, and 3 were found in the rotational splitting search. In the sequence search method we identified four sequences. The averaged spacing, probably a combination of the large separation and the rotational frequency, is 1.724 +/- 0.092 d(-1). Using the spacing and the scaling relation (rho) over bar = [ 0.0394, 0.0554] g cm(-3) was derived. The shift of the sequences proved to be the integer multiple of the rotational splitting spacing. Using the precise MOST frequencies and multicolour photometry in a hybrid way, we identified four modes with l = 1, two modes with l = 2, two modes with l = 3, and two modes as l = 0 radial modes.
引用
收藏
页码:4362 / 4379
页数:18
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