Search for pulsating pre-main-sequence stars in NGC 6383
- Author(s)
- Konstanze Zwintz, M Marconi, Peter Reegen, Werner Wolfgang Weiss
- Abstract
A search for pulsating pre-main-sequence (PMS) stars was performed in the young open cluster NGC 6383 using CCD time-series photometry in Johnson B and V filters. With an age of only ~1.7Myr all cluster members later than spectral type A0 have not reached the ZAMS yet, hence being ideal candidates for investigating PMS pulsation among A- and F-type stars. In total 286 stars have been analysed using classical Fourier techniques. From about a dozen stars within the boundaries of the classical instability strip, two stars were found to pulsate: NGC 6383 #170, with five frequencies simultaneously, and NGC 6383 #198, with a single frequency. In addition, NGC 6383 #152 is a suspected PMS variable star, but our data remain inconclusive. Linear, non-adiabatic models assuming PMS evolutionary phase and purely radial pulsation were calculated for the two new PMS pulsators. NGC 6383 #170 appears to pulsate radially in third and fifth overtones, while the other three frequencies seem to be of non-radial nature. NGC 6383 #198 pulsates monoperiodically, most probably in the third radial overtone. Magnitudes and B - V colours were available in the literature for only one third of all stars and we used them for calibrating the remaining.
- Organisation(s)
- Department of Astrophysics
- External organisation(s)
- INAF Astronomical Observatory of Capodimonte
- Journal
- Monthly Notices of the Royal Astronomical Society
- Volume
- 357
- Pages
- 345-353
- No. of pages
- 9
- ISSN
- 0035-8711
- Publication date
- 2005
- Peer reviewed
- Yes
- Austrian Fields of Science 2012
- 103003 Astronomy
- Portal url
- https://ucrisportal.univie.ac.at/en/publications/8749e3b2-c275-4a09-b8ea-7db6fdadbf34