Abstract
We study circumstellar disk evolution in young star forming regions under various environments, and here we present our recent results in Lynds 1641 located at Orion A cloud. Planet formation is one of the mechanisms for disk dispersal, however, other possible mechanisms include photoevaporation, grain growth, magneto-rotational instability, and close companion. In order to study disk dispersal mechanisms, we carried out multi-wavelength imaging and optical spectroscopic studies of young stellar objects (YSOs) in Lynds1641, and identified ?1390 YSOs. We followed up with optical spectroscopy using MMT/Hectospec and Hectochelle for low - high resolution spectroscopy. We summarize our recent findings from both imaging and spectroscopic analysis (Fang, Kim, van Boekel et al. 2013): we identifed 143 Class I sources, 131 Flat spectrum sources, 533 Class II sources, and 507 class III sources. Among the confirme YSOs, 46 of them are transition disks in L1641. We find that: (i) both clustered and isolated mode of star formation are seen in L1641; (ii) there are age differences in median age for different disk morphologies (?1.1Myr for optically thick disks, ?1.5Myr for trandision disks, and ?1.8Myr for diskless stars); (iii) ?80% of optically thick disks show accretion, while ?40-45% of transition disks show accretion; (iv) amplitude of accretion rate and variability for both optically thick disks and transition disks are similar; (v) accretion variability can account for about 0.6 dex in accretion rate vs. mass relation; and (vi) disk frequency of the L1641 region is about 50%.
Original language | English |
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Title of host publication | Tenth Pacific Rim Conference on Stellar Astrophysics |
Editors | Hee-Won Lee, Young Woon Kang, Kim-Ching Leung |
Place of Publication | United States |
Pages | 41 |
Number of pages | 1 |
Volume | 482 |
ISBN (Electronic) | 9781583818497 |
DOIs | |
Publication status | Published - Aug 2014 |
Event | Tenth Pacific Rim Conference on Stellar Astrophysics - Sejong University Convention Center, Seoul, Korea, Republic of Duration: 27 May 2014 → 31 May 2014 http://www.aconf.org/en-us/conf_30228.html |
Publication series
Name | ASP Conference Series |
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Publisher | Astronomical Society of the Pacific |
Conference
Conference | Tenth Pacific Rim Conference on Stellar Astrophysics |
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Country/Territory | Korea, Republic of |
City | Seoul |
Period | 27/05/14 → 31/05/14 |
Internet address |