1999AJ....118.1759D

Query : 1999AJ....118.1759D

1999AJ....118.1759D - Astron. J., 118, 1759-1765 (1999/October-0)

Spectroscopy of pre-main-sequence candidates of spectral type AF in the young galactic cluster IC 4996.

DELGADO A.J., MIRANDA L.F. and ALFARO E.J.

Abstract (from CDS):

We present the results of a spectroscopic analysis of the pre-main-sequence (PMS) candidates in IC 4996, proposed by Delgado et al. Spectral types and heliocentric radial velocities are calculated for 16 stars in the field observed by these authors, 13 of them located in the region of the color-magnitude diagram where their proposed PMS stars are located. The estimated heliocentric radial velocity of the cluster is centered around -12±5 km.s–1. From the radial velocity distribution, six stars are rejected as cluster members, one of them showing spectral features characteristic of an Am star. The remaining 10 stars are confirmed as cluster members: three B-type stars and seven PMS stars of spectral types A4-F0 (six stars) and early G (one star). One of the proposed PMS members clearly shows radial velocity and spectral type variations, as well as relatively broad Hα absorption. The G-type cluster member is a weak-lined T Tauri star with strong Li I λ6708 absorption [Wλ(Li I)≃0.26 Å]. These results strongly support the presence in the cluster of a populated sequence of PMS stars of AF spectral type.

Abstract Copyright: ∼

Journal keyword(s): Galaxy: Open Clusters and Associations: Individual: Alphanumeric: IC 4996 - Stars: Fundamental Parameters - Stars: Pre-Main-Sequence

Simbad objects: 40

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Number of rows : 40
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 * tet And ** 00 17 05.5023632446 +38 40 53.888625622 4.72 4.67 4.61 4.53 4.52 A2V 184 0
2 * eta Cas PM* 00 49 06.2945942922 +57 48 54.638239716 4.04 4.02 3.44 2.94 2.58 F9V 680 0
3 * tet Cas PM* 01 11 06.1620929203 +55 08 59.638991981 4.630 4.510 4.330 4.16 4.09 A7V 210 0
4 * ups And PM* 01 36 47.8415443907 +41 24 19.651368029 4.70 4.64 4.10 3.64 3.35 F9V 1017 1
5 HD 10307 SB* 01 41 47.1268541099 +42 36 48.221567818 5.69 5.58 4.96 4.43 4.10 G1V 523 0
6 * del Tri SB* 02 17 03.2303387763 +34 13 27.235383770 5.50 5.48   4.5   G0.5VFe-0.5 411 0
7 * tet Per PM* 02 44 11.9866154103 +49 13 42.414669174 4.62 4.62 4.11 3.67 3.37 F8V 428 0
8 * kap01 Cet BY* 03 19 21.6964175772 +03 22 12.714979884 5.71 5.52 4.85 4.27 3.91 G5V 948 0
9 HD 21447 * 03 30 00.1828170168 +55 27 06.506069256 5.160 5.140 5.090 5.01 5.02 A1Va 147 0
10 BD+48 944 * 03 31 55.8072950208 +48 35 01.691136276   8.37 8.19     A4V 52 0
11 * 10 Tau PM* 03 36 52.3837044168 +00 24 05.992097829 5.23 5.15 4.30 4.09 3.77 F9IV-V 595 0
12 V* V1210 Tau gD* 03 47 04.2131220000 +23 59 42.773483436   8.67 8.38   8.02 F0V 138 0
13 HD 26015 PM* 04 07 41.9838821088 +15 09 46.041084720   6.45 6.07     F3V 180 0
14 V* V895 Tau BY* 04 24 12.4710867960 +14 45 29.565731196   8.217 7.583 8.43   G0V(e) 237 0
15 * sig Boo PM* 14 34 40.8173867232 +29 44 42.457673940 4.76 4.84 4.47 4.13 3.94 F4VkF2mF1 632 0
16 * 110 Her PM* 18 45 39.7256792847 +20 32 46.713086264 4.66 4.65 4.19 3.80 3.54 F5.5IV-V 427 0
17 * b Aql PM* 19 24 58.1999714302 +11 56 39.888480530 6.35 5.93   4.7   G7IVHdel1 522 0
18 Cl* IC 4996 DAM 34 * 20 16 21.3156402864 +37 37 17.883051780 16.77 16.31 15.47     A8 2 0
19 Cl* IC 4996 DAM 32 * 20 16 21.8835731736 +37 39 34.883356320 16.54 16.10 15.30     A5 7 0
20 Cl* IC 4996 DAM 319 * 20 16 22.52 +37 37 16.4   20.03 18.39     ~ 2 0
21 Cl* IC 4996 DAM 31 * 20 16 25.3147559208 +37 40 24.892500540 16.40 15.97 15.22     A5 4 0
22 Cl* IC 4996 DAM 78 * 20 16 25.7464577928 +37 42 21.656839068 16.13 15.67 14.91     A4 2 0
23 Cl* IC 4996 DAM 28 * 20 16 29.34 +37 39 09.9 16.06 15.72 14.98     A7 2 0
24 Cl* IC 4996 DAM 30 * 20 16 29.8503581400 +37 39 30.277562220 16.21 15.78 15.03     A4 4 0
25 Cl* IC 4996 DAM 16 * 20 16 31.1628136320 +37 39 09.830503476 14.45 14.39 13.83     B7 3 0
26 IC 4996 30 * 20 16 31.2057765240 +37 40 02.304043248 10.35 9.82 9.44     B3 10 0
27 Cl* IC 4996 DAM 33 * 20 16 31.91 +37 39 09.1 16.59 16.19 15.31     A7 2 0
28 IC 4996 OpC 20 16 32.7 +37 38 46           ~ 187 0
29 IC 4996 33 * 20 16 34.4466527688 +37 39 54.971883972 13.53 13.65 13.16     B5 8 0
30 Cl* IC 4996 DAM 80 * 20 16 36.5569586592 +37 39 36.163648512 16.15 15.74 14.97     A9 6 0
31 Cl* IC 4996 DAM 40 * 20 16 39.21 +37 39 21.7 17.22 16.77 15.90     F0 3 0
32 Cl* IC 4996 DAM 36 * 20 16 40.0936887480 +37 40 06.642604920 16.92 16.385 15.456     A9 3 0
33 Cl* IC 4996 PUR 54 * 20 16 40.4437835568 +37 34 57.494599212   14.49 13.82     B7 1 0
34 Cl* IC 4996 VBP 119 * 20 16 41.47 +37 39 58.8 16.69 16.35 15.38     F4 3 0
35 Cl* IC 4996 DAM 43 * 20 16 42.1883058504 +37 40 07.652329752 18.19 17.54 16.36     ~ 4 0
36 IC 4996 49 * 20 16 42.6240046488 +37 39 12.601855296 12.52 12.80 12.40     B3 9 0
37 HD 193702 ** 20 20 15.21965 +39 24 11.5969           A1V 94 0
38 Cl Berkeley 86 OpC 20 20 20.6 +38 42 15           ~ 130 0
39 M 29 OpC 20 23 42.9 +38 29 25   7.30 6.6     ~ 256 0
40 * eps Cep SB* 22 15 02.1972987635 +57 02 36.846735569   4.47   4.0   F0V(Sr) 237 0

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