2002MNRAS.336..189S

Query : 2002MNRAS.336..189S

2002MNRAS.336..189S - Mon. Not. R. Astron. Soc., 336, 189-196 (2002/October-2)

β Cephei and new pulsating stars in NGC 4755.

STANKOV A., HANDLER G., HEMPEL M. and MITTERMAYER P.

Abstract (from CDS):

We present the results of a photometric multi-colour, two-site observing campaign of β Cephei stars in the young open cluster NGC 4755. More than 260 h of time-series U, B, V filter data of the cluster were acquired on two continents during 1999 and 2000. We list the detected pulsation frequencies and discuss the results of their analysis. Mode identification of the detected modes is performed as well.

In addition, we present the detection of four new variable stars in NGC 4755. We give frequency solutions as indicators of the time-scales and amplitudes of the pulsations. NGC 4755-116 is probably a B2 dwarf with a period of 4.2 d whose variability is caused by a spot or g-mode pulsation. NGC 4755-405 can be considered as a new β Cephei star with two pulsation frequencies. For NGC 4755-215 we found one frequency and for NGC 4755-316 three pulsation frequencies; we suggest that both are new slowly pulsating B stars of short period.

Abstract Copyright: RAS

Journal keyword(s): stars: individual: NGC 4755-F - stars: individual: NGC 4755-G - stars: individual: NGC 4755-I - stars: oscillations - stars: variables: other - open clusters and associations: individual: NGC 4755

Simbad objects: 14

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Number of rows : 14

N	Identifier	Otype	ICRS (J2000) RA	ICRS (J2000) DEC	Mag U	Mag B	Mag V	Mag R	Sp type	#ref 1850 - 2026	#notes
1	CD-59 4454	bC?	12 53 20.6734801416	-60 23 16.843450812	9.26	9.90	9.74	10.03	B1V	56	0
2	CPD-59 4532	bC*	12 53 25.6733913792	-60 22 00.097867236	9.72	10.288	10.142		B1V	29	0
3	NGC 4755 116	Pu*	12 53 36.1106965368	-60 20 32.394674940		12.73	12.55	12.57	A0II	9	0
4	V* EF Cru	bC*	12 53 38.0320508592	-60 22 39.511308972	9.65	10.295	10.174		B2	26	0
5	NGC 4755	OpC	12 53 39.2	-60 22 07					~	300	0
6	CPD-59 4548	Pu*	12 53 43.3353634416	-60 24 02.277375948		11.613	11.452		B3Vn	11	0
7	CPD-59 4549	bC*	12 53 43.8838517496	-60 22 29.353445652	9.04	9.92	9.78	10.04	B1.5V	41	0
8	CPD-59 4550	bC*	12 53 46.9935752640	-60 18 35.656553808	9.63	10.49	10.29		B1.5Vn	35	0
9	V* EH Cru	Pu*	12 53 49.3863341544	-60 20 57.491933928		11.89	11.69	11.69	B3V	16	1
10	CPD-59 4558	bC*	12 53 51.7420242144	-60 21 58.595523264	9.56	10.162	10.024		B2IV	28	0
11	LS 2814	bC*	12 53 52.0067925720	-60 22 15.879036216	8.92	9.54	9.38	9.81	B1V	34	0
12	CPD-59 4560	bC*	12 53 52.2399372840	-60 22 27.810162912	9.07	9.76	9.60	9.95	B1.5V	36	0
13	CPD-59 4562	bC*	12 53 53.0059575120	-60 21 30.852990432	9.71	10.363	10.204		B2Vn	23	0
14	CPD-59 4564	bC*	12 53 57.5386794336	-60 24 58.092625152	8.45	9.12	9.06	9.64	B2III	65	0

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