A NEW ANALYSIS OF THE TWO CLASSICAL ZZ CETI WHITE DWARFS GD 165 AND ROSS 548. I. PHOTOMETRY AND SPECTROSCOPY

Journal Article · Thu Dec 10 04:00:00 EST 2015 · Astrophysical Journal

DOI:https://doi.org/10.1088/0004-637X/815/1/56· OSTI ID:22521791

Giammichele, N.; Fontaine, G.; Bergeron, P.; Brassard, P. ^[1]; Charpinet, S.; Vauclair, G. ^[2]; Pfeiffer, B. ^[3]

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1. Département de Physique, Université de Montréal, Montréal, QC H3C 3J7 (Canada)
2. CNRS, UPS-OMP, Université de Toulouse, 14 avenue Edouard Belin, F-31400 Toulouse (France)
3. Department of Physics and Astronomy, Langara College, Vancouver, BC V5Y 2Z6 (Canada)

We present the first of a two-part seismic analysis of the two bright hot ZZ Ceti stars GD 165 and Ross 548. In this first part, we report the results of frequency extraction exercises based on time-series data sets of exceptional quality. We uncovered up to 13 independent pulsation modes in GD 165, regrouped into six main frequency multiplets. These include 9 secure (signal-to-noise ratio, S/N > 4) detections and 4 possible ones (4 ≥ S/N ≥ 3). Likewise, we isolated 11 independent modes in Ross 548 (9 secure and 2 possible detections), also regrouped into 6 multiplets. The multiplet structure is likely caused by rotational splitting. We also provide updated estimates of the time-averaged atmospheric properties of these two pulsators in the light of recent developments on the front of atmospheric modeling for DA white dwarfs.

• OSTI ID: 22521791
• Journal Information: Astrophysical Journal, Journal Name: Astrophysical Journal Journal Issue: 1 Vol. 815; ISSN ASJOAB; ISSN 0004-637X
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
DETECTION
EMISSION SPECTROSCOPY
MULTIPLETS
OSCILLATIONS
PHOTOMETRY
PULSATIONS
SIGNAL-TO-NOISE RATIO
VISIBLE RADIATION
WHITE DWARF STARS