Issue |
A&A
Volume 380, Number 1, December II 2001
|
|
---|---|---|
Page(s) | 142 - 147 | |
Section | Interstellar and circumstellar matter | |
DOI | https://doi.org/10.1051/0004-6361:20011132 | |
Published online | 15 December 2001 |
HD 12098 -A new northern hemisphere roAp star
1
ISRO Satellite Centre, Airport road, Bangalore-560 017, India
2
South African Astronomical Observatory, PO Box 9, Observatory 7935, South Africa
3
State Observatory, Manora Peak, Naini Tal-263 129, India
4
Dept. of Astronomy, University of Cape Town, Rondebosch 7700, South Africa
5
Centre for Astrophysics, University of Central Lancashire, Preston PR1 2HE, UK
Corresponding author: S. Seetha seetha@isac.ernet.in
Received:
10
July
2001
Accepted:
10
August
2001
We present the analysis of 65 hours of high speed photometric observations of
HD 12098 taken from State Observatory, Naini Tal and Gurushikhar Observatory,
Mt. Abu on sixteen nights spanning from November 1999 to November 2000. HD 12098
is the first rapidly oscillating Ap star discovered from the "Naini Tal-Cape
survey for northern hemisphere roAp stars". It is the 32nd in the
complete list. HD 12098 exhibits one predominant mode of oscillation at
mHz. The second-most significant frequency in our data is at
mHz with a 1 cycle/day alias ambiguity. We argue that
is a rotational sidelobe of
, rather than an independent
pulsation mode.
Evidence for the presence of two other frequencies at 2.1807 and 2.3056 mHz
is also presented.
Key words: stars: chemically peculiar / stars: oscillations / stars: individual: HD 12098
© ESO, 2001
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