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 M_V(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

Full paper

View the references in ADS

Number of rows : 43

N	Identifier	Otype	ICRS (J2000) RA	ICRS (J2000) DEC	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			~	797	0
2	Ton 1	HS?	07 03 38.8307252496	+26 35 31.995693132	14.4				~	9	0
3	NGC 2419	GlC	07 38 08.51	+38 52 54.9		10.05			~	916	0
4	NGC 2808	GlC	09 12 03.10	-64 51 48.6					~	1395	0
5	NGC 4372	GlC	12 25 45.43	-72 39 32.7	10.86	9.85			~	296	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					~	3364	0
9	M 3	GlC	13 42 11.62	+28 22 38.2		6.39			~	2450	0
10	M 5	GlC	15 18 33.22	+02 04 51.7		5.95			~	1946	0
11	NGC 5986	GlC	15 46 03.00	-37 47 11.1		6.92			~	360	0
12	M 80	GlC	16 17 02.41	-22 58 33.9					~	699	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			~	2169	0
16	NGC 6229	GlC	16 46 58.641	+47 31 36.38	9.38	9.86			~	359	0
17	M 12	GlC	16 47 14.18	-01 56 54.7		6.07			~	658	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			~	771	0
20	NGC 6256	GlC	16 59 32.68	-37 07 17.1					~	148	0
21	M 62	GlC	17 01 12.60	-30 06 44.5					~	599	0
22	M 19	GlC	17 02 37.69	-26 16 04.6	8.45	5.57			~	359	1
23	NGC 6284	GlC	17 04 28.747	-24 45 51.22	10.72	7.43			~	272	0
24	NGC 6293	GlC	17 10 10.42	-26 34 54.2					~	273	0
25	M 92	GlC	17 17 07.39	+43 08 09.4		6.52			~	2074	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					~	167	0
28	ESO 455-11	GlC	17 31 05.20	-29 58 54.0					~	165	0
29	NGC 6388	GlC	17 36 17.461	-44 44 08.34	7.40				~	893	1
30	M 14	GlC	17 37 36.15	-03 14 45.3	9.55	5.73			~	375	0
31	NGC 6441	GlC	17 50 13.06	-37 03 05.2					~	867	0
32	NGC 6453	GlC	17 50 51.77	-34 35 55.1	10.49				~	161	0
33	V* BL Her	WV*	18 01 09.2240599584	+19 14 56.696475012	10.54	9.70			F0	170	0
34	NGC 6569	GlC	18 13 38.88	-31 49 35.2	10.78	9.47			~	233	0
35	M 28	GlC	18 24 32.89	-24 52 11.4					~	752	0
36	M 54	GlC	18 55 03.33	-30 28 47.5					~	1047	0
37	NGC 6749	OpC	19 05 15.36	+01 54 00.0		12.4			~	153	0
38	NGC 6752	GlC	19 10 52.11	-59 59 04.4					~	1966	0
39	M 56	GlC	19 16 35.57	+30 11 00.5					~	410	0
40	M 15	GlC	21 29 58.33	+12 10 01.2					~	3105	0
41	M 2	GlC	21 33 27.02	-00 49 23.7		6.25			~	1014	1
42	NAME Galactic Bulge	reg	~	~					~	4173	0
43	NAME Local Group	GrG	~	~					~	8155	0

To bookmark this query, right click on this link: simbad:objects in 2007A&A...471..893D and select 'bookmark this link' or equivalent in the popup menu