Discovery of the pre-main sequence progenitors of the magnetic Ap/Bp stars?

被引:99
作者
Wade, GA
Drouin, D
Bagnulo, S
Landstreet, JD
Mason, E
Silvester, J
Alecian, E
Böhm, T
Bouret, JC
Catala, C
Donati, JF
机构
[1] Royal Mil Coll Canada, Dept Phys, Kingston, ON K7K 4B4, Canada
[2] European So Observ, Santiago 19, Chile
[3] Univ Western Ontario, Dept Phys & Astron, London, ON N6A 3K7, Canada
[4] Queens Univ, Dept Phys, Kingston, ON K7L 3N6, Canada
[5] Observ Paris, LESIA, F-92195 Meudon, France
[6] Observ Midi Pyrenees, F-31400 Toulouse, France
[7] Lab Astrophys Marseille, F-13376 Marseille, France
关键词
stars : atmospheres; stars : magnetic fields; stars : pre-main sequence; stars : chemically peculiar; stars; individual; HD; 72106; 101412; V380; Ori;
D O I
10.1051/0004-6361:200500184
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We report the discovery, using FORS1 at the ESO-VLT and ESPaDOnS at the CFHT, of magnetic fields in the young A-type stars HD 101412, V380 Ori and HD 72106A. Two of these stars ( HD 101412 and V380 Ori) are pre-main sequence Herbig AeAe/ Be (HAeBe) stars, while one ( HD 72106A) is physically associated with a HAeBe star. Remarkably, evidence of surface abundance spots is detected in the spectra of HD 72106A. The magnetic fields of these objects display intensities of order 1 kG at the photospheric play photospheric level, are ordered on global scales, and appear in approximately 10% of the stars studied. Based on these properties, the detected stars may well represent pre-main sequence progenitors of the magnetic Ap/Bp stars. The low masses inferred for these objects (2.6, 2.8 and 2.4 M-.) represent additional contradictions to the hypothesis of Hubrig et al. ( 2000, ApJ, 539, 352), who claim that magnetic fields appear in intermediate-mass stars only after 30% of their main sequence evolution is complete. Finally, we fail to confirm claims by Hubrig et al. ( 2004, A&A, 428, L1) of magnetic fields in the Herbig Ae star HD 139614.
引用
收藏
页码:L31 / L34
页数:4
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