تقرير
A method to determine distances to molecular clouds using near-IR photometry
| العنوان: | A method to determine distances to molecular clouds using near-IR photometry |
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| المؤلفون: | Maheswar, G., Lee, C. -W., Bhatt, H. C., Mallik, S. V., Dib, Sami |
| المصدر: | Astronomy & Astrophysics, 2010, 509, 44 |
| سنة النشر: | 2010 |
| المجموعة: | Astrophysics |
| مصطلحات موضوعية: | Astrophysics - Galaxy Astrophysics |
| الوصف: | Aims: We aim to develop a method to determine distances to molecular clouds using JHK near-infrared photometry. Methods: The method is based on a technique that aids spectral classification of stars lying towards the fields containing the clouds into main sequence and giants. In this technique, the observed (J-H) and (H-K_s) colours are dereddened simultaneously using trial values of A V and a normal interstellar extinction law. The best fit of the dereddened colours to the intrinsic colours giving a minimum value of Chi^2 then yields the corresponding spectral type and A_V for the star. The main sequence stars, thus classified, are then utilized in an A V versus distance plot to bracket the cloud distances. Results: We applied the method to four clouds, L1517, Chamaeleon I, Lupus 3 and NGC 7023 and estimated their distances as 167+-30, 151+-28, 157+-29 and 408+-76 pc respectively, which are in good agreement with the previous distance estimations available in the literature Comment: Published in A&A, 2010, 509, 44. Accepted 23 september 2009 |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1051/0004-6361/200912594 |
| URL الوصول: | http://arxiv.org/abs/1011.2390 |
| رقم الأكسشن: | edsarx.1011.2390 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1051/0004-6361/200912594 |
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