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A near-infrared variability study in the cloud IC1396W: low star-forming efficiency and two new eclipsing binaries

Scholz, A., Froebrich, D., Davis, C.J., Meusinger, H. (2010) A near-infrared variability study in the cloud IC1396W: low star-forming efficiency and two new eclipsing binaries. Monthly Notices of the Royal Astronomical Society, 406 (1). pp. 505-516. ISSN 00358711 (ISSN). (doi:10.1111/j.1365-2966.2010.16680.x) (The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided)

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Abstract

Identifying the population of young stellar objects (YSOs) in high-extinction regions is a pre-requisite for studies of star formation. This task is not trivial, as reddened background objects can be indistinguishable from YSOs in near-infrared colour-colour diagrams. Here we combine deep JHK photometry with J- and K-band light curves, obtained with the United Kingdom Infrared Telescope, to explore the YSO population in the dark cloud IC1396W. We demonstrate that a colour-variability criterion can provide useful constraints on the star-forming activity in embedded regions. For IC1396W we find that a near-infrared colour analysis alone vastly overestimates the number of YSOs. In total, the globule probably harbours not more than 10 YSOs, among them a system of two young stars embedded in a small (�10 000 au) reflection nebula. This translates into a star-forming efficiency (SFE) of �1 per cent, which is low compared with nearby more massive star-forming regions, but similar to less massive globules. We confirm that IC1396W is likely associated with the IC1396 H ii region. One possible explanation for the low SFE is the relatively large distance to the ionizing O star in the central part of IC1396. Serendipitously, our variability campaign yields two new eclipsing binaries, and eight periodic variables, most of them with the characteristics of contact binaries. © 2010 The Authors. Journal compilation © 2010 RAS.

Item Type: Article
DOI/Identification number: 10.1111/j.1365-2966.2010.16680.x
Additional information: Unmapped bibliographic data: LA - English [Field not mapped to EPrints] J2 - Mon. Not. R. Astron. Soc. [Field not mapped to EPrints] AD - School of Cosmic Physics, Dublin Institute for Advanced Studies, 31 Fitzwilliam Place, Dublin 2, Ireland [Field not mapped to EPrints] AD - SUPA, School of Physics and Astronomy, University of St Andrews, North Haugh, St Andrews KY16 9SS, United Kingdom [Field not mapped to EPrints] AD - Centre for Astrophysics and Planetary Science, University of Kent, Canterbury CT2 7NH, United Kingdom [Field not mapped to EPrints] AD - Joint Astronomy Centre, 660 North A'ohoku Place, University Park, Hilo, HI 96720, United States [Field not mapped to EPrints] AD - Thüringer Landessternwarte Tautenburg, Sternwarte 5, D-07778 Tautenburg, Germany [Field not mapped to EPrints] DB - Scopus [Field not mapped to EPrints]
Uncontrolled keywords: Circumstellar matter, Stars: formation, Stars: pre-main-sequence, Stars: variables: general
Subjects: Q Science > QB Astronomy > QB460 Astrophysics
Divisions: Faculties > Sciences > School of Physical Sciences > Centre for Astrophysics and Planetary Sciences
Depositing User: Giles Tarver
Date Deposited: 21 Jul 2015 10:09 UTC
Last Modified: 29 May 2019 14:51 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/49567 (The current URI for this page, for reference purposes)
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