Optical/IR studies of Be stars in NGC 6834 with emphasis on two specific stars
We present optical and infrared photometric and spectroscopic studies of two Be stars in the 70-80-Myr-old open cluster NGC 6834. NGC 6834（1） has been reported as a binary from speckle interferometric studies whereas NGC 6834（2） may possibly be a γ Cas-like variable. Infrared photometry and spectros...
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| Veröffentlicht in: | Research in astronomy and astrophysics 2014-09, Vol.14 (9), p.1173-1192 |
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| container_title | Research in astronomy and astrophysics |
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| creator | Mathew, Blesson Varricatt, Watson P. Subramaniam, Annapurni Ashok, N. M. Banerjee, D. P. K. |
| description | We present optical and infrared photometric and spectroscopic studies of two Be stars in the 70-80-Myr-old open cluster NGC 6834. NGC 6834（1） has been reported as a binary from speckle interferometric studies whereas NGC 6834（2） may possibly be a γ Cas-like variable. Infrared photometry and spectroscopy from the United Kingdom Infrared Telescope （UKIRT）, and optical data from various facilities are combined with archival data to understand the nature of these candidates. High signal-to-noise near-IR spectra obtained from UKIRT have enabled us to study the optical depth effects in the hydrogen emission lines of these stars. We have explored the spectral classification scheme based on the intensity of emission lines in the H and K bands and contrasted it with the conventional classification based on the intensity of hydrogen and helium absorption lines. This work also presents hitherto unavailable UBV CCD photometry of NGC 6834, from which the evolutionary state of the Be stars is identified. |
| doi_str_mv | 10.1088/1674-4527/14/9/008 |
| format | Article |
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We have explored the spectral classification scheme based on the intensity of emission lines in the H and K bands and contrasted it with the conventional classification based on the intensity of hydrogen and helium absorption lines. 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High signal-to-noise near-IR spectra obtained from UKIRT have enabled us to study the optical depth effects in the hydrogen emission lines of these stars. We have explored the spectral classification scheme based on the intensity of emission lines in the H and K bands and contrasted it with the conventional classification based on the intensity of hydrogen and helium absorption lines. This work also presents hitherto unavailable UBV CCD photometry of NGC 6834, from which the evolutionary state of the Be stars is identified.</abstract><doi>10.1088/1674-4527/14/9/008</doi><tpages>20</tpages><oa>free_for_read</oa></addata></record> |
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| ispartof | Research in astronomy and astrophysics, 2014-09, Vol.14 (9), p.1173-1192 |
| issn | 1674-4527 2397-6209 |
| language | eng |
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| source | Institute of Physics Journals; Alma/SFX Local Collection |
| subjects | CCD测光 Classification Emission analysis Evolutionary Infrared photometry Infrared telescopes NGC Photometry Spectroscopy Stars 光谱学 分类方案 恒星 点对 红外望远镜 |
| title | Optical/IR studies of Be stars in NGC 6834 with emphasis on two specific stars |
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