MOST observations of the young open cluster NGC 2264

Details MOST observations of the young open cluster NGC 2264 MOST observations of the young open cluster NGC 2264

Jul 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009a%26a...502..239z&link_type=abstract

Astronomy and Astrophysics, Volume 502, Issue 1, 2009, pp.239-252

Astronomy and Astrophysics

Astrophysics

11

Stars: Pre-Main Sequence, Open Clusters And Associations: Individual: Ngc 2264, Δ Sct, Techniques: Photometric

Scientific paper

Context: Photometric time series obtained from space are one of the best ways to study pulsations in pre-main sequence (PMS) stars, especially as the corresponding amplitudes are at the millimagnitude level or below. We present high-precision time-series photometry of stars in the field of NGC 2264 obtained with the MOST (Microvariability & Oscillations of STars) satellite. Aims: A search for pulsating A and F type members of NGC 2264 with ultra-precise MOST photometry was conducted. Methods: 68 stars in the field of NGC 2264 were observed simultaneously with the MOST satellite, 34 of which were previously identified as potential targets to search for PMS pulsation. The routines SigSpec and Period04 were used for the frequency analysis. Results: We discovered pulsation in 4 potential A and F type PMS members of NGC 2264 with frequencies between 2.7 h and 23 min. For one of the PMS pulsators identified with MOST after the first days of observation, simultaneous ground-based Strömgren photometry was obtained with the OSN 0.9 m telescope and confirms the highest frequency identified in the MOST photometry. 26 stars with other (i.e., hotter and cooler) spectral types show clear variability: SPB and γ Doradus pulsation, red giant oscillations, eclipsing binaries and variability caused by rotational modulation.
Based on data from the MOST satellite, a Canadian Space Agency mission, jointly operated by Dynacon Inc., the University of Toronto Institute for Aerospace Studies and the University of British Columbia with the assistance of the University of Vienna.

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