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

Abstract

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.

Authors:
; ; ;  [1]; ;  [2];  [3]
  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)
Publication Date:
OSTI Identifier:
22521791
Resource Type:
Journal Article
Journal Name:
Astrophysical Journal
Additional Journal Information:
Journal Volume: 815; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0004-637X
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; DETECTION; EMISSION SPECTROSCOPY; MULTIPLETS; OSCILLATIONS; PHOTOMETRY; PULSATIONS; SIGNAL-TO-NOISE RATIO; VISIBLE RADIATION; WHITE DWARF STARS

Citation Formats

Giammichele, N., Fontaine, G., Bergeron, P., Brassard, P., Charpinet, S., Vauclair, G., and Pfeiffer, B.. A NEW ANALYSIS OF THE TWO CLASSICAL ZZ CETI WHITE DWARFS GD 165 AND ROSS 548. I. PHOTOMETRY AND SPECTROSCOPY. United States: N. p., 2015. Web. doi:10.1088/0004-637X/815/1/56.
Giammichele, N., Fontaine, G., Bergeron, P., Brassard, P., Charpinet, S., Vauclair, G., & Pfeiffer, B.. A NEW ANALYSIS OF THE TWO CLASSICAL ZZ CETI WHITE DWARFS GD 165 AND ROSS 548. I. PHOTOMETRY AND SPECTROSCOPY. United States. doi:10.1088/0004-637X/815/1/56.
Giammichele, N., Fontaine, G., Bergeron, P., Brassard, P., Charpinet, S., Vauclair, G., and Pfeiffer, B.. Thu . "A NEW ANALYSIS OF THE TWO CLASSICAL ZZ CETI WHITE DWARFS GD 165 AND ROSS 548. I. PHOTOMETRY AND SPECTROSCOPY". United States. doi:10.1088/0004-637X/815/1/56.
@article{osti_22521791,
title = {A NEW ANALYSIS OF THE TWO CLASSICAL ZZ CETI WHITE DWARFS GD 165 AND ROSS 548. I. PHOTOMETRY AND SPECTROSCOPY},
author = {Giammichele, N. and Fontaine, G. and Bergeron, P. and Brassard, P. and Charpinet, S. and Vauclair, G. and Pfeiffer, B.},
abstractNote = {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.},
doi = {10.1088/0004-637X/815/1/56},
journal = {Astrophysical Journal},
issn = {0004-637X},
number = 1,
volume = 815,
place = {United States},
year = {2015},
month = {12}
}