2006A&A...450..227C

Query : 2006A&A...450..227C

2006A&A...450..227C - Astronomy and Astrophysics, volume 450227-231 (2006/4-4)

Discovery of eleven new ZZ Ceti stars.

CASTANHEIRA B.G., KEPLER S.O., MULLALLY F., WINGET D.E., KOESTER D., VOSS B., KLEINMAN S.J., NITTA A., EISENSTEIN D.J., NAPIWOTZKI R. and REIMERS D.

Abstract (from CDS):

We report the discovery of eleven new ZZ Cetis using telescopes at OPD (Observatorio do Pico dos Dias/LNA) in Brazil, the 4.1m SOAR (Southern Astrophysical Research) telescope at Cerro Pachon, Chile, and the 2.1m Otto Struve telescope at McDonald observatory. The candidates were selected from the SDSS (Sloan Digital Sky Survey) and SPY (ESO SN Ia progenitor survey), based on their Teff obtained from optical spectra fitting. This selection criterion yields the highest success rate of detecting new ZZ Cetis, above 90% in the Teff range from 12000 to 11000K. We also report on a DA not observed to vary, with a Teff placing the star close to the blue edge of the instability strip. Among our new pulsators, one is slightly cooler than this star for which pulsations were not detected. Our observations are an important constraint on the location of the blue edge of the ZZ Ceti instability strip.

Abstract Copyright: ∼

Journal keyword(s): stars: white dwarfs - stars: variables: general - stars: oscillations

CDS comments: Tables: SDSS J153332.9-020600.0 is not an SDSS member of the SDSS catalogue, this object is EQ J153332.9-020600.0 in SIMBAD.

Simbad objects: 13

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Number of rows : 13
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 JL 197 WD* 00 33 36.1026919440 -55 08 38.947696044   15.89 15.73 15.90   DA 27 0
2 US 3201 WD* 02 49 22.3427904000 -01 00 06.798202776   19.3 18.89     DA 16 0
3 GALEX J125710.5+012423 WD* 12 57 10.5041680224 +01 24 22.974150132   18.38 18.69     DA 21 0
4 GALEX J153332.9-020655 WD* 15 33 32.9656612536 -02 06 55.726221204           DA 29 0
5 GALEX J161837.3-002302 WD* 16 18 37.2484035024 -00 23 02.787239760   18.98 19.30     DA5 14 0
6 SDSS J164115.61+352140.6 WD* 16 41 15.6141187296 +35 21 40.631466996   18.76 19.11     DA 15 0
7 GALEX J212808.4-000749 WD* 21 28 08.4877379040 -00 07 50.909832876   17.67 18.03     DA 21 0
8 SDSS J213530.33-074330.8 WD* 21 35 30.3242541240 -07 43 30.743917428   18.29 18.70     DA 20 0
9 GALEX J214723.7-001358 WD* 21 47 23.7281829696 -00 13 58.451492532   18.69 19.05     DA 12 0
10 GALEX J215354.1-073121 WD* 21 53 54.1177011264 -07 31 21.841969980   17.94 18.69     DA 15 0
11 GALEX J223135.7+134653 WD* 22 31 35.7134570040 +13 46 52.850624556   18.40 18.65     DA 16 0
12 SDSS J230726.66-084700.3 WD* 23 07 26.6580428088 -08 47 00.296435148   18.55 18.89     DA 14 0
13 GALEX J235040.8-005429 WD* 23 50 40.7298561264 -00 54 30.912096492           DA 26 0

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