Delta a Photometric survey of the small magellanic cloud
| Authors | |
|---|---|
| Year of publication | 2019 |
| Type | Article in Proceedings |
| Conference | Symposium S339 (Southern Horizons in Time-Domain Astronomy) |
| MU Faculty or unit | |
| Citation | |
| Web | https://www.cambridge.org/core/journals/proceedings-of-the-international-astronomical-union/article/photometric-survey-of-the-small-magellanic-cloud/489C1CF7F548C8BD7718196AE027BF49 |
| Doi | http://dx.doi.org/10.1017/S1743921318002995 |
| Keywords | Stars: chemically peculiar; stars: emission-line; Be; galaxies: Small Magellanic Cloud; techniques: photometric: Detla a |
| Description | The narrow-band delta a photometric system measures the flux depression at lambda 5200 angstrom by comparing the flux at the band centre to adjacent regions. It has been shown that virtually all peculiar stars with magnetic fields (mCPs) have significant positive delta a values (of up to +100 mmag), whereas Be/Ae/B[e] and metal weak stars (including lambda Bootis types) exhibit significant negative values of delta a. By using this photometric system we are therefore able to detect chemically peculiar (CP), emission types and metal-weak stars in an efficient way. The poster presented the first results of our survey of the Small Magellanic Cloud. In the selected field we found only 0.5 % of bona fide CP stars against 15 % in our Galaxy. |
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