Search for pulsating pre-main-sequence stars in NGC 6383

Autor(en)

Konstanze Zwintz, M Marconi, Peter Reegen, Werner Wolfgang Weiss

Abstrakt

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(en)

Institut für Astrophysik

Externe Organisation(en)

INAF-Osservatorio Astronomico di Capodimonte

Journal

Monthly Notices of the Royal Astronomical Society

Band

357

Seiten

345-353

Anzahl der Seiten

9

ISSN

0035-8711

Publikationsdatum

2005

Peer-reviewed

Ja

ÖFOS 2012

103003 Astronomie

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/8749e3b2-c275-4a09-b8ea-7db6fdadbf34