2000A&AS..145..481Z


C.D.S. - SIMBAD4 rel 1.7 - 2021.01.16CET13:42:37

2000A&AS..145..481Z - Astron. Astrophys., Suppl. Ser., 145, 481-490 (2000/September-0)

Variable HST guide stars (I).

ZWINTZ K., WEISS W.W., KUSCHNIG R., GRUBER R., FRANDSEN S., GRAY R. and JENKNER H.

Abstract (from CDS):

We have performed time series analyses on more than 4500 sets of Hubble Space Telescope (HST) Fine Guidance Sensor (FGS) data, obtained from about 3600 guide stars in the period from August 1992 to December 1995. We discuss here a subset of 20 stars that were found to be variable at a high confidence level. This subset contains all definite variables in our sample for which at least spectral type, B-V, or Stroemgren colors, respectively, are available. Our variability survey is characterized by comparably high photometric accuracy and high time resolution. The time base of a data set for a given guide star can range from half an hour to several days and even up to years in some cases. The elimination of scintillation noise in a space-borne experiment and the usage of the identical instrument throughout the survey results in very homogeneous data with a typical photometric precision of about 500ppm, and with a best case of 50ppm. Half of the cases discussed here are probably δ Sct variables, and two are eclipsing binaries. We have also found four K-type stars with a photometric period of a few hours, which is difficult to interpret as rotation. Currently, several space missions are in preparation, dedicated to high precision photometry with the goal of applying asteroseismic techniques to a significant sample of stars. The HST-FGS data provide an excellent testing ground for modelling the photometric characteristics of such space experiments and for gaining experience in handling the issues related to the respective data and algorithms.

Abstract Copyright:

Journal keyword(s): instrumentation: photometers - surveys - stars: general - stars: oscillations - δ Scu - stars: variables: other

Nomenclature: Table 1: VGS NN (Nos 1-20).

Simbad objects: 22

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Number of rows : 22

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 V* UV Tri dS* 01 32 00.1072585167 +30 21 56.334069106   11.23 11.13     A3 19 0
2 V* AR Tri dS* 01 34 42.6296802739 +30 25 28.037231819   10.88 10.55 10.9   ~ 5 0
3 V* V1235 Tau dS* 04 32 10.1891378671 +17 43 18.132964401   11.64 11.11     F0 6 0
4 V* V1760 Ori Or* 05 35 51.6566799546 -05 08 09.008686555   13.59 12.34   10.74 K1/2Ve 39 0
5 V* EE Lyn dS* 08 14 50.3019823400 +48 49 16.197070358   9.37 9.10     F0 12 0
6 V* AZ Cam bL* 09 14 38.4385543863 +81 56 30.402761784   10.17 9.82     F0 32 0
7 V* LW UMa dS* 09 56 56.1520870886 +41 26 41.374451151   10.38 10.20     ~ 2 0
8 NAME Hubble Deep Field reg 12 36 49.5 +62 12 58           ~ 1840 1
9 V* PV Vir dS* 12 55 36.2948179359 -05 38 35.415841864   12.17 11.71     F 2 0
10 TYC 1995-2185-1 V* 13 00 48.4366753026 +27 48 03.965869084 13.878 12.79 11.37 12.648 11.562 K2III-IV 7 1
11 TYC 1995-1825-1 V* 13 01 45.7893126164 +27 57 40.665310551   12.42 11.68 11.74   K2Ib 9 0
12 HD 116466 V* 13 24 33.5142079885 -43 04 58.340234714   10.51 8.92     K4(III) 6 0
13 V* V1030 Cen dS* 13 28 01.7388970879 -47 23 19.465830976   9.97 9.399     G8/K0III+A5/8 9 0
14 V* NT Lup dS* 14 32 00.8294803745 -44 26 28.647559806   11.48 11.18     ~ 3 0
15 HD 139377 V* 15 37 54.0738541373 -04 44 19.182852999   10.12 9.79     A3II/III 3 0
16 V* V1080 Her dS* 16 36 27.8376565225 +14 11 36.416863732   10.09 9.86     A2 2 0
17 V* V5505 Sgr dS* 18 03 57.8999415211 -29 56 59.897378154   11.82 11.47   10.807 F 5 0
18 V* V1592 Sgr Mi* 18 19 20.9770236130 -28 38 22.564927261     12     M5e 6 1
19 HD 317382 V* 18 19 23.0719451897 -28 28 56.502974736   11.21 11.18     F0: 4 1
20 HD 168922 * 18 23 29.0196799114 -30 15 30.410115898   10.01 9.80     B8IV 7 0
21 V* V5535 Sgr bL* 18 24 57.4300556271 -30 24 42.666820166   11.24 10.77   10.448 A2V 6 0
22 V* V5111 Sgr dS* 19 40 00.5525658492 -31 13 16.854667782   12.08 11.78     ~ 3 0

    Equat.    Gal    SGal    Ecl

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2021.01.16-13:42:37

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