2013A&A...552A..92M


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.13CEST00:53:29

2013A&A...552A..92M - Astronomy and Astrophysics, volume 552A, 92-92 (2013/4-1)

NGC 7419 as a template for red supergiant clusters.

MARCO A. and NEGUERUELA I.

Abstract (from CDS):

The open cluster NGC 7419 is known to contain five red supergiants and a very high number of Be stars. However, there are conflicting reports about its age and distance that prevent a useful comparison with other clusters. We intend to obtain more accurate parameters for NGC 7419, using techniques different from those of previous authors, so that it may be used as a calibrator for more obscured clusters. We obtained Stroemgren photometry of the open cluster NGC 7419, as well as classification spectroscopy of ∼20 stars in the area. We then applied standard analysis and classification techniques. We find a distance of 4±0.4kpc and an age of 14±2Myr for NGC 7419. The main-sequence turn-off is found at spectral type B1, in excellent agreement. We identify 179 B-type members, implying that there are more than 1200M in B stars at present. Extrapolating this to lower masses indicates an initial cluster mass of between 7000 and 10000M, depending on the shape of the initial mass function. We find a very high fraction (≃40%) of Be stars around the turn-off, but very few Be stars at lower masses. We also report for the first time a strong variability in the emission characteristics of Be stars. We verified that the parameters of the red supergiant members can be used to obtain accurate cluster parameters. NGC 7419 is sufficiently massive to serve as a testbed for theoretical predictions and as a template to compare more obscured clusters. The distribution of stars above the main-sequence turn-off is difficult to accommodate with current evolutionary tracks. Though the presence of five red supergiants is marginally consistent with theoretical expectations, the high number of Be stars and very low number of luminous evolved B stars hint at some unknown physical factor that is not considered in current synthesis models.

Abstract Copyright:

Journal keyword(s): open clusters and associations: individual: NGC 7419 - Hertzsprung-Russell and C-M diagrams - stars: early-type - stars: emission-line, Be - supergiants

VizieR on-line data: <Available at CDS (J/A+A/552/A92): table3.dat table4.dat table7.dat>

Status at CDS:   All or part of tables of objects could be ingested in SIMBAD with priority 2.

Simbad objects: 67

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Number of rows : 67

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 9446 1
2 NGC 330 Cl* 00 56 20.59 -72 27 12.5 9.37 9.76 9.55   8.89 ~ 366 0
3 NGC 663 OpC 01 46 09 +61 14.1   7.78 7.1     ~ 235 0
4 BD+56 504 * 02 18 40.3142601020 +57 06 03.140504483 9.17 9.611 8.4735   8.0657 B1.5III 32 0
5 NGC 869 800 * 02 18 42.6254323859 +57 10 25.582945778 12.33 12.579 12.2727   11.8249 B3.2V 17 0
6 NGC 869 837 * 02 18 47.2393925178 +57 09 26.902144461   14.583 14.1176   13.450 B7.4V 13 0
7 BD+56 514 * 02 18 49.6415940795 +57 05 32.451460060   11.13 10.51     ~ 12 0
8 NGC 869 935 * 02 18 55.4882767372 +57 07 52.882390512   14.498 14.1878   13.595 B6.6V 14 0
9 NGC 869 950 * 02 18 56.8341533362 +57 10 51.214678459 11.22 11.653 11.381   10.8896 B2.0III 30 0
10 BD+56 519 * 02 18 58.9756507122 +57 08 42.320558816 9.54 10.00 9.7460     B2.0III 25 0
11 BD+56 518 * 02 18 58.9985303369 +57 09 26.630155049 10.53 10.97 10.6840   9.8608 B2.0III 40 0
12 NGC 869 OpC 02 19 00 +57 07.7           ~ 426 0
13 NGC 869 991 * 02 19 00.2317699760 +57 08 22.692728869 11.43 11.770 11.4650   10.9918 B1.6III 19 0
14 BD+56 521 * 02 19 01.7290174901 +57 10 43.148695677 10.73 10.844 10.3051   9.8469 B8V 29 0
15 BD+56 524 * 02 19 06.4288606895 +57 07 33.898940877 9.60 10.09 9.8200     B1.0V 63 0
16 NGC 869 1181 * 02 19 15.1494258886 +57 08 12.593566518   13.05 12.6917   12.1583 B3.0V 14 0
17 NGC 869 1187 * 02 19 16.5713071778 +57 10 59.248744788 10.8 11.21 10.8430   10.1438 B1.0V 28 0
18 NAME NGC 869/884 OpC 02 20.5 +57 08           ~ 51 0
19 Ass Per OB 1 As* 02 21 +57.6           ~ 160 1
20 NGC 884 2005 * 02 21 27.8395136993 +57 07 23.934367335   13.97 13.6726   13.132 B6.3V 10 0
21 2MASS J02214964+5708215 V* 02 21 49.6555560338 +57 08 21.528545946 11.941 11.65 11.3379   11.0050 B2V 32 0
22 NGC 884 2147 * 02 21 50.3839699169 +57 08 47.286560506 15.627 14.83 14.3805   13.804 B8.7V 14 0
23 NGC 884 2167 * 02 21 52.9433812410 +57 08 03.882367274 14.317 13.77 13.396   12.924 B5.0V 14 0
24 NGC 884 2196 * 02 21 57.6765781126 +57 09 25.698271441 12.177 11.89 11.579   11.149 B2.0III 32 0
25 BD+56 571 V* 02 22 00.9421259342 +57 08 14.311916675 9.14 9.69 8.4004   7.9314 B1V 38 0
26 NGC 884 2330 * 02 22 12.2958351050 +57 06 53.619398254 12.043 11.66 11.4739   11.1155 B1.9III 15 0
27 NGC 884 OpC 02 22 23 +57 07.5           ~ 445 0
28 BD+56 590 V* 02 22 48.9645070067 +57 09 13.967129678 9.85 10.16 10.0180   8.5257 B1.1V 23 0
29 V* S Per s*r 02 22 51.7103845023 +58 35 11.454759954 13.22 10.55 7.90     M4.5-7Iae 354 0
30 NGC 1039 267 * 02 41 58.3950575005 +42 46 03.205454746   12.43 11.96     ~ 15 0
31 BD+42 590 * 02 42 01.7700056370 +42 44 53.996850576   9.85 9.82     A2 19 0
32 NGC 1039 278 * 02 42 02.9552538067 +42 47 00.328039462   12.11 11.83     A4 13 0
33 NGC 1039 OpC 02 42 05 +42 45.7           ~ 370 0
34 NGC 1039 284 * 02 42 06.4057787989 +42 45 56.787813359   10.95 10.67     A1 18 0
35 BD+42 592 * 02 42 10.1035930438 +42 45 11.284196129   11.52 11.18     A5 18 0
36 BD+42 594 * 02 42 12.1324636326 +42 47 10.953079504   10.06 9.92     A0 18 0
37 BD+42 595 * 02 42 12.9626644691 +42 44 49.511359269   9.88 9.77     ~ 15 0
38 ACO 426 ClG 03 19 47.2 +41 30 47           ~ 1939 1
39 NGC 1502 49 * 04 07 27.2370134125 +62 21 44.839363225   11.3 11.0     B3V 19 0
40 NGC 1502 30 * 04 07 32.2933374870 +62 19 12.696265149   10.23 9.66     B1V 18 0
41 NGC 1502 35 * 04 07 33.2062218474 +62 19 52.401171162   10.99 10.49     B3V 13 0
42 NGC 1502 45 * 04 07 41.3788801223 +62 21 54.737491110   11.5 11.433     B4.5V 9 0
43 NGC 1502 OpC 04 07 50 +62 19.9   7.47 6.9     ~ 167 1
44 NGC 1502 41 * 04 08 02.1077280540 +62 21 07.880033528   13.77 12.93     ~ 6 0
45 NGC 1502 42 * 04 08 02.9743831266 +62 21 52.184941699   13.21 12.61     ~ 8 0
46 NGC 1818 GlC 05 04 13.300 -66 26 05.47   9.7       ~ 236 0
47 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 14832 1
48 V* VY CMa s*r 07 22 58.32877 -25 46 03.2355 12.01 10.19 7.95     M5Iae 996 0
49 Mrk 50 Sy1 12 23 24.1368239628 +02 40 44.452269820   17.25 16.63     ~ 192 0
50 V* VX Sgr s*r 18 08 04.0431479808 -22 13 26.629744195 11.72 9.41 6.52 3.90 2.11 M8.5Ia 545 0
51 NAME Cyg Arm PoG 20 02 +40.0           ~ 141 0
52 NGC 6910 28 * 20 22 58.4634647214 +40 46 13.650464916   13.00 12.27     F2 13 0
53 NGC 6910 20 * 20 23 05.1800465689 +40 45 42.872668215   12.15 10.95     B1V 10 0
54 NGC 6910 OpC 20 23 08 +40 46.5   7.13 7.4     ~ 165 0
55 NGC 6910 21 * 20 23 16.5920142530 +40 48 01.938988702   12.53 11.79     B1V 12 0
56 NGC 6910 24 * 20 23 18.6751773979 +40 48 38.228102616   12.59 11.77     B1V 11 0
57 HD 229201 * 20 23 21.4655789789 +40 44 08.924304960   10.8 10.64     A0: 14 0
58 NML Cyg s*r 20 46 25.5382179476 +40 06 59.396202678   18.64 16.60     M7/8 483 0
59 Cl* NGC 7419 BNSW e s*r 22 54 01.2192880729 +60 47 41.722718121   17.79 13.87     M1.5Iab 11 0
60 Cl* NGC 7419 BNSW d s*r 22 54 16.0930971866 +60 49 28.992718371   14.34 12.86 11.89   M2Iab 10 0
61 NGC 7419 OpC 22 54 20 +60 48.9     13.0     ~ 85 0
62 Cl* NGC 7419 BNSW c s*r 22 54 22.6647062773 +60 48 31.551653277   16.49 12.91 11.89   M2Iab 8 0
63 Cl* NGC 7419 BNSW a s*r 22 54 30.4465848837 +60 47 50.573791299   16.44 13.05 12.00   M2Iab 12 0
64 V* MY Cep s*r 22 54 31.6975860144 +60 49 38.970114015           M7.5I 78 0
65 NGC 7510 OpC 23 11.0 +60 34   8.77 7.9     ~ 88 1
66 NGC 7538 OpC 23 13 37 +61 30.0           ~ 827 0
67 NAME Scutum Spiral Arm PoG ~ ~           ~ 275 0

    Equat.    Gal    SGal    Ecl

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2020.07.13-00:53:29

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