{"title":"开放星团波鸿的结构分析","authors":"Harmeen Kaur, Saurabh Sharma, Alok Durgapal, Lokesh K. Dewangan, Aayushi Verma, Neelam Panwar, Rakesh Pandey, Arpan Ghosh","doi":"10.1007/s12036-023-09953-9","DOIUrl":null,"url":null,"abstract":"<div><p>We present the results from our deep optical photometric observations of Bochum 2 (Boc2) star cluster obtained using the 1.3-m Devasthal Fast Optical Telescope along with archival photometric data from Pan-STARRS2/2MASS/UKIDSS surveys. We also used high-quality parallax and proper motion data from the Gaia Data Release 3. We found that the Boc2 cluster has a small size (<span>\\(\\sim \\)</span>1.1 pc) and circular morphology. Using Gaia parallax of member stars and isochrone fitting method, the distance of this cluster is estimated as <span>\\(3.8\\pm 0.4\\)</span> kpc. We have found that this cluster holds young (<span>\\({\\sim }5\\)</span> Myr) and massive (O7–O9) stars as well as an older population of low mass stars. We found that the massive stars were formed in the inner region of the Boc2 cluster in a recent epoch of star formation. We have derived mass function slope (<span>\\(\\Gamma \\)</span>) in the cluster region as <span>\\(-2.42\\pm 0.13\\)</span> in the mass range of <span>\\({\\sim }0.72<M/M_{\\odot }<2.8\\)</span>. The tidal radius of the Boc2 cluster (<span>\\(\\sim \\)</span>7–9) is much more than its observed radius (<span>\\({\\sim }1.1\\)</span> pc). This suggests that most of the low-mass stars in this cluster are the remains of an older population of stars formed via an earlier epoch of star formation.</p></div>","PeriodicalId":610,"journal":{"name":"Journal of Astrophysics and Astronomy","volume":"44 2","pages":""},"PeriodicalIF":1.1000,"publicationDate":"2023-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Structural analysis of open cluster Bochum 2\",\"authors\":\"Harmeen Kaur, Saurabh Sharma, Alok Durgapal, Lokesh K. Dewangan, Aayushi Verma, Neelam Panwar, Rakesh Pandey, Arpan Ghosh\",\"doi\":\"10.1007/s12036-023-09953-9\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>We present the results from our deep optical photometric observations of Bochum 2 (Boc2) star cluster obtained using the 1.3-m Devasthal Fast Optical Telescope along with archival photometric data from Pan-STARRS2/2MASS/UKIDSS surveys. We also used high-quality parallax and proper motion data from the Gaia Data Release 3. We found that the Boc2 cluster has a small size (<span>\\\\(\\\\sim \\\\)</span>1.1 pc) and circular morphology. Using Gaia parallax of member stars and isochrone fitting method, the distance of this cluster is estimated as <span>\\\\(3.8\\\\pm 0.4\\\\)</span> kpc. We have found that this cluster holds young (<span>\\\\({\\\\sim }5\\\\)</span> Myr) and massive (O7–O9) stars as well as an older population of low mass stars. We found that the massive stars were formed in the inner region of the Boc2 cluster in a recent epoch of star formation. We have derived mass function slope (<span>\\\\(\\\\Gamma \\\\)</span>) in the cluster region as <span>\\\\(-2.42\\\\pm 0.13\\\\)</span> in the mass range of <span>\\\\({\\\\sim }0.72<M/M_{\\\\odot }<2.8\\\\)</span>. The tidal radius of the Boc2 cluster (<span>\\\\(\\\\sim \\\\)</span>7–9) is much more than its observed radius (<span>\\\\({\\\\sim }1.1\\\\)</span> pc). This suggests that most of the low-mass stars in this cluster are the remains of an older population of stars formed via an earlier epoch of star formation.</p></div>\",\"PeriodicalId\":610,\"journal\":{\"name\":\"Journal of Astrophysics and Astronomy\",\"volume\":\"44 2\",\"pages\":\"\"},\"PeriodicalIF\":1.1000,\"publicationDate\":\"2023-06-24\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Journal of Astrophysics and Astronomy\",\"FirstCategoryId\":\"101\",\"ListUrlMain\":\"https://link.springer.com/article/10.1007/s12036-023-09953-9\",\"RegionNum\":4,\"RegionCategory\":\"物理与天体物理\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q3\",\"JCRName\":\"ASTRONOMY & ASTROPHYSICS\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Astrophysics and Astronomy","FirstCategoryId":"101","ListUrlMain":"https://link.springer.com/article/10.1007/s12036-023-09953-9","RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"ASTRONOMY & ASTROPHYSICS","Score":null,"Total":0}
We present the results from our deep optical photometric observations of Bochum 2 (Boc2) star cluster obtained using the 1.3-m Devasthal Fast Optical Telescope along with archival photometric data from Pan-STARRS2/2MASS/UKIDSS surveys. We also used high-quality parallax and proper motion data from the Gaia Data Release 3. We found that the Boc2 cluster has a small size (\(\sim \)1.1 pc) and circular morphology. Using Gaia parallax of member stars and isochrone fitting method, the distance of this cluster is estimated as \(3.8\pm 0.4\) kpc. We have found that this cluster holds young (\({\sim }5\) Myr) and massive (O7–O9) stars as well as an older population of low mass stars. We found that the massive stars were formed in the inner region of the Boc2 cluster in a recent epoch of star formation. We have derived mass function slope (\(\Gamma \)) in the cluster region as \(-2.42\pm 0.13\) in the mass range of \({\sim }0.72<M/M_{\odot }<2.8\). The tidal radius of the Boc2 cluster (\(\sim \)7–9) is much more than its observed radius (\({\sim }1.1\) pc). This suggests that most of the low-mass stars in this cluster are the remains of an older population of stars formed via an earlier epoch of star formation.
期刊介绍:
The journal publishes original research papers on all aspects of astrophysics and astronomy, including instrumentation, laboratory astrophysics, and cosmology. Critical reviews of topical fields are also published.
Articles submitted as letters will be considered.