大麦哲伦星系棒状结构中的前主序星候选体

Pre-Main-Sequence Star Candidates in the Bar of the Large Magellanic Cloud.

作者信息

Beaulieu JP, Lamers HJGLM, Grison P, Julien R, Lanciaux C, Ferlet R, Vidal-Madjar A, Bertin E, Maurice E, Prevot L, Gry C, Guibert J, Moreau O, Tajhmady F, Aubourg E, Bareyre P, Gros M, Laurent B, Lachieze-Rey M, Lesquoy E, Magneville C, Milsztajn A, Moscoso L, Queinnec F, Renault C, Rich J, Spiro M, Vigroux L, Zylberajch S, Ansari R, Cavalier F, Moniez M

机构信息

The EROS (Experience de Recherche d'Objets Sombres) collaboration: J. P. Beaulieu, P. Grison, R. Julien, C. Lanciaux, R. Ferlet, A. Vidal-Madjar, Institut d'Astrophysique de Paris, 98bis Boulevard, Arago, 75014 Paris, France. H. J. G. L. M. Lamers, Astronomical Institute, Princetonplein 5, NL-3584 CC Utrecht, Netherlands, and SRON Laboratory for Space Research, Sorbonnelaan 2, NL-3584 CA Utrecht, Netherlands. E. Bertin, Institut d'Astrophysique de Paris, 98bis Boulevard, Arago, 75014 Paris, France, and ESO La Silla, casilla 19001, Santiago 19, Chile. E. Maurice and L. Prevot, Observatoire de Marseille, 2 place Le Verrier, 13248 Marseille 04, France. C. Gry, Laboratoire d'Astronomie Spatiale CNRS, Traversee du siphon, les trois lucs, 13120 Marseille, France. J. Guibert, O. Moreau, F. Tajhmady, Centre d'Analyse des Images de l'Institut National des Sciences de l'Univers, CNRS Observatoire de Paris, 61 Avenue de l'Observatoire, 75014 Paris, France. E. Aubourg, P. Bareyre, J. de Kat, M. Gros, B. Laurent, M. Lachieze-Rey, E. Lesquoy, C. Magneville, A. Milsztajn, L. Moscoso, F. Queinnec, C. Renault, J. Rich, M. Spiro, L. Vigroux, S. Zylberajch, CEA, DSM/DAPNIA, Centre d'etudes de Saclay, 91191 Gif-sur-Yvette, France. R. Ansari, F. Cavalier, M. Moniez, Laboratoire de l'Accelerateur Lineaire IN2P3, Centre d'Orsay, 91405 Orsay, France.

出版信息

Science. 1996 May 17;272(5264):995-7. doi: 10.1126/science.272.5264.995.

DOI:10.1126/science.272.5264.995

PMID:8662586

Abstract

Candidate pre-main-sequence stars were observed in the bar of the Large Magellanic Cloud during the search for dark matter in the galactic halo. Seven blue stars of apparent visual magnitude 15 to 17 had irregular photometric variations and hydrogen emission lines in their optical spectra, which suggested that these stars are pre-main-sequence stars of about 10 solar masses. These stars are slightly more massive and definitely more luminous than are Herbig AeBe pre-main-sequence stars in our own galaxy. Continued observations of these very young stars from another galaxy, which are probably at the pre-hydrogen-burning stage, should provide important clues about early stages of star formation.

摘要

在对银河系晕中暗物质的搜索过程中，在大麦哲伦星云的棒状结构中观测到了候选前主序星。七颗视星等为15至17的蓝色恒星具有不规则的光度变化，并且在其光谱中有氢发射线，这表明这些恒星是约10个太阳质量的前主序星。这些恒星比我们银河系中的赫比格AeBe前主序星质量稍大且亮度肯定更高。对来自另一个星系的这些非常年轻的恒星（可能处于氢燃烧前阶段）进行持续观测，应该能提供有关恒星形成早期阶段的重要线索。