2007A&A...471..893D


Query : 2007A&A...471..893D

2007A&A...471..893D - Astronomy and Astrophysics, volume 471, 893-900 (2007/9-1)

Synthetic properties of bright metal-poor variables. II. BL Hercules stars.

DI CRISCIENZO M., CAPUTO F., MARCONI M. and CASSISI S.

Abstract (from CDS):

We investigate the properties of the so-called BL Her stars, i.e., Population II Cepheids with periods shorter than 8 days, using updated pulsation models and evolutionary tracks computed by adopting a metal abundance in the range of Z=0.0001 to Z=0.004. We derive the predicted period-magnitude (PM) and period-Wesenheit (PW) relations at the various photometric bands and we show that the slopes of these relations are in good agreement with the slopes determined by observed variables in Galactic globular clusters, independently of the adopted MV(RR)-[Fe/H] relation to get the cluster RR Lyrae-based distance. Moreover, we show that the distances provided by the predicted PM and PW relations for BL Her stars agree within the errors with the RR Lyrae-based values. Using the predicted relations with W Vir stars, which are Population II Cepheids with periods longer than 8 days, provides no clear evidence for or against a change in the PM and PW slopes around P∼10days.

Abstract Copyright:

Journal keyword(s): stars: evolution - stars: population II - stars: variables: general

Simbad objects: 43

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Number of rows : 43
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 M 79 GlC 05 24 10.59 -24 31 27.3     8.16     ~ 788 0
2 Ton 1 HS? 07 03 38.8307252496 +26 35 31.995693132   14.4       ~ 7 0
3 NGC 2419 GlC 07 38 08.51 +38 52 54.9     10.05     ~ 907 0
4 NGC 2808 GlC 09 12 03.10 -64 51 48.6           ~ 1378 0
5 NGC 4372 GlC 12 25 45.43 -72 39 32.7   10.86 9.85     ~ 291 0
6 Cl* NGC 4372 KK V28 Ce* 12 25 47.48 -72 41 07.0           ~ 3 0
7 Cl* NGC 4372 KK V24 Ce* 12 25 49.56 -72 40 22.7           ~ 3 0
8 NGC 5139 GlC 13 26 47.28 -47 28 46.1           ~ 3330 0
9 M 3 GlC 13 42 11.62 +28 22 38.2     6.39     ~ 2425 0
10 M 5 GlC 15 18 33.22 +02 04 51.7     5.95     ~ 1926 0
11 NGC 5986 GlC 15 46 03.00 -37 47 11.1     6.92     ~ 352 0
12 M 80 GlC 16 17 02.41 -22 58 33.9           ~ 690 0
13 NGC 6205 66 * 16 41 23.0399537280 +36 28 05.357933076   14.73 14.10     ~ 12 0
14 NGC 6205 187 * 16 41 31.58 +36 28 44.4   15.22 15.18     ~ 7 0
15 M 13 GlC 16 41 41.634 +36 27 40.75     5.8     ~ 2146 0
16 NGC 6229 GlC 16 46 58.641 +47 31 36.38   9.38 9.86     ~ 353 0
17 M 12 GlC 16 47 14.18 -01 56 54.7     6.07     ~ 646 0
18 NGC 6254 2089 WV* 16 56 55.9633888200 -04 04 16.393870344   13.62 12.761   11.721 ~ 20 0
19 M 10 GlC 16 57 09.05 -04 06 01.1     4.98     ~ 761 0
20 NGC 6256 GlC 16 59 32.68 -37 07 17.1           ~ 143 0
21 M 62 GlC 17 01 12.60 -30 06 44.5           ~ 589 0
22 M 19 GlC 17 02 37.69 -26 16 04.6   8.45 5.57     ~ 355 1
23 NGC 6284 GlC 17 04 28.747 -24 45 51.22   10.72 7.43     ~ 267 0
24 NGC 6293 GlC 17 10 10.42 -26 34 54.2           ~ 269 0
25 M 92 GlC 17 17 07.39 +43 08 09.4     6.52     ~ 2049 0
26 Cl* NGC 6341 SAW V7 Ce* 17 17 07.6125125040 +43 07 21.380956644       14.49   ~ 16 0
27 NGC 6325 GlC 17 17 59.27 -23 45 57.7           ~ 163 0
28 ESO 455-11 GlC 17 31 05.20 -29 58 54.0           ~ 161 0
29 NGC 6388 GlC 17 36 17.461 -44 44 08.34   7.40       ~ 883 1
30 M 14 GlC 17 37 36.15 -03 14 45.3   9.55 5.73     ~ 365 0
31 NGC 6441 GlC 17 50 13.06 -37 03 05.2           ~ 856 0
32 NGC 6453 GlC 17 50 51.77 -34 35 55.1   10.49       ~ 156 0
33 V* BL Her WV* 18 01 09.2240599584 +19 14 56.696475012   10.54 9.70     F0 167 0
34 NGC 6569 GlC 18 13 38.88 -31 49 35.2   10.78 9.47     ~ 226 0
35 M 28 GlC 18 24 32.89 -24 52 11.4           ~ 742 0
36 M 54 GlC 18 55 03.33 -30 28 47.5           ~ 1033 0
37 NGC 6749 OpC 19 05 15.36 +01 54 00.0     12.4     ~ 148 0
38 NGC 6752 GlC 19 10 52.11 -59 59 04.4           ~ 1944 0
39 M 56 GlC 19 16 35.57 +30 11 00.5           ~ 403 0
40 M 15 GlC 21 29 58.33 +12 10 01.2           ~ 3084 0
41 M 2 GlC 21 33 27.02 -00 49 23.7     6.25     ~ 1000 1
42 NAME Galactic Bulge reg ~ ~           ~ 4096 0
43 NAME Local Group GrG ~ ~           ~ 8040 0

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2023.06.04-17:05:47

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