2003A&A...402..733D


Query : 2003A&A...402..733D

2003A&A...402..733D - Astronomy and Astrophysics, volume 402, 733-743 (2003/5-1)

A photometric monitoring of bright high-amplitude δ Scuti stars. II. Period updates for seven stars.

DEREKAS A., KISS L.L., SZEKELY P., ALFARO E.J., CSAK B., MESZAROS S., RODRIGUEZ E., ROLLAND A., SARNECZKY K., SZABO G.M., SZATMARY K., VARADI M. and KISS C.

Abstract (from CDS):

We present new photometric data for seven high-amplitude δ Scuti stars. The observations were acquired between 1996 and 2002, mostly in the Johnson photometric system. For one star (GW UMa), our observations are the first since the discovery of its pulsational nature from the Hipparcos data. The primary goal of this project was to update our knowledge on the period variations of the target stars. For this, we have collected all available photometric observations from the literature and constructed decades-long O-C diagrams of the stars. This traditional method is useful because of the single-periodic nature of the light variations. Text-book examples of slow period evolution (XX Cyg, DY Her, DY Peg) and cyclic period changes due to light-time effect (LITE) in a binary system (SZ Lyn) are updated with the new observations. For YZ Boo, we find a period decrease instead of increase. The previously suggested LITE-solution of BE Lyn (Kiss & Szatmary 1995IBVS.4166....1K) is not supported with the new O-C diagram. Instead of that, we suspect the presence of transient light curve shape variations mimicking small period changes.

Abstract Copyright:

Journal keyword(s): stars: variables: general - stars: oscillations - δ Sct

Simbad objects: 21

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Number of rows : 21
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 TYC 2979-1343-1 * 08 09 29.8207490592 +44 24 28.914541632   11.80 11.36     ~ 3 0
2 V* SZ Lyn dS* 08 09 35.7485046672 +44 28 17.600052000   9.73 9.08     F2 149 0
3 TYC 2979-1329-1 * 08 09 55.8154474584 +44 25 48.669808944   11.83 10.91     ~ 3 0
4 * e UMa dS* 09 16 11.3270161512 +54 01 18.686385192   4.995 4.805   4.58 A6V 136 0
5 HD 79576 * 09 16 34.2650977944 +46 10 50.540741652   10.12 9.69     F8 13 0
6 HD 79763 SB* 09 17 31.1787692016 +46 49 02.022620988   5.996 5.938     A1V 62 0
7 V* BE Lyn dS* 09 18 17.1802207368 +46 09 11.310054192 9.110 9.040 8.800     A3 73 0
8 TYC 3425-544-1 * 09 18 21.6922387224 +46 10 44.863135788   12.02 11.28     ~ 1 0
9 HD 80079 * 09 19 15.3305273256 +46 56 37.580341488   6.86 6.89     A0 15 0
10 TYC 3011-2535-1 PM* 10 43 54.6827850672 +44 38 25.348520508   11.41 11.00     ~ 3 0
11 BD+45 1859 ** 10 44 11.2784070960 +44 40 44.127842880   10.24 9.89 9.74   F3V 25 0
12 Sz 40 Or* 11 12 09.8312703024 -76 34 36.490702728   15.2     13.41 M4.5Ve 56 0
13 V* YZ Boo dS* 15 24 06.9993392928 +36 52 00.601700700 10.62 10.54 10.36     F0 120 1
14 V* DY Her dS* 16 31 17.9532980880 +11 59 52.455542712   10.80 10.50     A9.7:III 131 0
15 V* V567 Oph dS* 17 58 27.2142123024 +01 06 05.222602440   11.65 11.08     G5 53 0
16 V* XX Cyg SX* 20 03 15.6420308880 +58 57 16.525249632   11.99 11.86     A5-F5 117 0
17 V* V2109 Cyg dS* 20 08 50.4196310928 +48 54 39.414335760   7.84 7.49     F0 26 0
18 GSC 01712-01246 * 23 08 40.5484627296 +17 08 14.413579620     11.1     ~ 3 0
19 V* DY Peg SX* 23 08 51.1858042512 +17 12 55.997525808   10.56 10.26     F5 199 1
20 GSC 01712-00542 * 23 08 51.5234223216 +17 10 49.150822008     11.7     ~ 1 0
21 HD 218587 * 23 09 05.0511876240 +17 08 20.764755456   10.42 9.91     G0 14 0

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2023.02.01-21:08:01

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