Open clusters in Auriga OB2

被引:10
作者
Marco, Amparo [1 ,2 ]
Negueruela, Ignacio [1 ]
机构
[1] Univ Alicante, EPS, DFISTS, Carretera San Vicente del Raspeig S-N, E-03690 San Vicente Del Raspeig, Spain
[2] Univ Florida, Dept Astron, 211 Bryant Space Sci Ctr, Gainesville, FL 32611 USA
基金
美国国家航空航天局; 美国国家科学基金会;
关键词
stars: early-type; stars: evolution; Hertzsprung-Russell and colour-magnitude diagrams; open clusters and associations: individual: Alicante 11; open clusters and associations: individual: Alicante 12; open clusters and associations: individual: Stock 8; STAR-FORMING REGIONS; MAIN-SEQUENCE STARS; TRIGONOMETRIC PARALLAXES; SPECTRAL CLASSIFICATION; FUNDAMENTAL PARAMETERS; EXPLORER OBSERVATIONS; HBETA PHOTOMETRY; STELLAR CONTENTS; SPIRAL STRUCTURE; STANDARD STARS;
D O I
10.1093/mnras/stw640
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We study the area around the HII region Sh 2-234, including the young open cluster Stock 8, to investigate the extent and definition of the association Aur OB2 and the possible role of triggering in massive cluster formation. We obtained Stromgren and J, H, K-S photometry for Stock 8 and Stromgren photometry for two other cluster candidates in the area, which we confirm as young open clusters and name Alicante 11 and Alicante 12. We took spectroscopy of similar to 33 early-type stars in the area, including the brightest cluster members. We calculate a common distance of 2.80(-0.24)(+0.27) kpc for the three open clusters and surrounding association. We derive an age 4-6 Ma for Stock 8, and do not find a significantly different age for the other clusters or the association. The star LS V + 34 degrees 23, with spectral type O8 II( f), is likely the main source of ionization of Sh 2-234. We observe an important population of pre-mainsequence stars, some of them with discs, associated with the B-type members lying on the main sequence. We interpret the region as an area of recent star formation with some residual and very localized ongoing star formation. We do not find evidence for sequential star formation on a large scale. The classical definition of Aur OB2 has to be reconsidered, because its two main open clusters, Stock 8 and NGC 1893, are not at the same distance. Stock 8 is probably located in the Perseus arm, but other nearby HII regions whose distances also place them in this arm show quite different distances and radial velocities and, therefore, are not connected.
引用
收藏
页码:880 / 901
页数:22
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