2018A&A...619A.132C

Query : 2018A&A...619A.132C

2018A&A...619A.132C - Astronomy and Astrophysics, volume 619A132-132 (2018/11-1)

Pseudo-photometric distances of 30 open clusters.

CHELLI A. and DUVERT G.

Abstract (from CDS):


Aims. We demonstrate that reliable photometric distances of stellar clusters, and more generally of stars, can be obtained using pseudomagnitudes and rough spectral type without having to correct for visual absorption.
Methods. We determine the mean absolute pseudomagnitude of all spectral (sub)types between B and K. Distances are computed from the difference between the star's observed pseudomagnitude and its spectral type's absolute pseudomagnitude. We compare the distances of 30 open clusters thus derived against the distances derived from TGAS parallaxes.
Results. Our computed distances, up to distance modulus 12, agree within 0.1 mag rms with those obtained from TGAS parallaxes, proving excellent distance estimates. We show additionally that there are actually two markedly different distances in the cluster NGC 2264.
Conclusions. We suggest that the pseudomagnitude distance estimation method, which is easy to perform, can be routinely used in all large-scale surveys where statistical distances on a set of stars, such as an open cluster, are required.

Abstract Copyright: © ESO 2018

Journal keyword(s): stars: distances - methods: observational - methods: data analysis - techniques: photometric

VizieR on-line data: <Available at CDS (J/A+A/619/A132): table1.dat table2.dat>

Simbad objects: 33

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Number of rows : 33
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 Cl Blanco 1 OpC 00 03 04.1 -29 48 55           ~ 380 0
2 Cl Stock 2 OpC 02 15 47.8 +59 33 12           ~ 155 0
3 NGC 869 OpC 02 18 57.0 +57 08 02           ~ 504 0
4 NGC 884 OpC 02 22 15.7 +57 08 59           ~ 503 0
5 Cl Melotte 20 MGr 03 26 50.6 +48 51 48           ~ 928 0
6 Cl Melotte 22 OpC 03 46 38.0 +24 10 41           ~ 3679 0
7 Cl Melotte 25 OpC 04 30 27.4 +16 46 43           ~ 3309 0
8 NGC 1647 OpC 04 46 00.4 +19 05 06   6.82 6.4     ~ 189 0
9 Cl Collinder 70 OpC 05 35 30 -01 06.0           ~ 65 0
10 NGC 2232 OpC 06 27 45.6 -04 44 26           ~ 212 0
11 NGC 2264F PoC 06 40 07 +09 37.9           ~ 4 1
12 NGC 2264 OpC 06 40 53.7 +09 52 32           ~ 1876 0
13 NGC 2264N Cld 06 40 59.9 +09 50 34           ~ 11 1
14 Cl Collinder 140 OpC 07 23 23.9 -31 58 15           ~ 154 0
15 NGC 2422 OpC 07 36 35.8 -14 30 15           ~ 275 0
16 NGC 2451A OpC 07 42 55.4 -38 15 05           ~ 159 0
17 NGC 2451 Cl* 07 45.4 -37 58           ~ 165 1
18 NGC 2516 OpC 07 58 00.5 -60 46 36           ~ 793 0
19 NGC 2547 OpC 08 10 01.5 -49 12 08           ~ 445 0
20 NGC 2632 OpC 08 39 58.4 +19 36 33           ~ 1733 0
21 IC 2391 OpC 08 41 17.5 -53 03 00           ~ 871 0
22 NGC 2682 OpC 08 51 23.5 +11 48 54           ~ 2528 0
23 IC 2602 OpC 10 42 55.9 -64 25 22           ~ 735 0
24 Cl Trumpler 16 OpC 10 45 01.9 -59 42 00           ~ 510 0
25 NGC 3532 OpC 11 05 33.9 -58 42 13           ~ 414 0
26 Cl Melotte 111 OpC 12 11 54.9 +25 16 36           ~ 520 0
27 IC 4665 OpC 17 46 04.0 +05 36 54           ~ 407 0
28 NGC 6475 OpC 17 53 44.1 -34 49 36           ~ 413 0
29 NGC 6633 OpC 18 27 30.2 +06 38 21           ~ 423 0
30 NGC 6811 OpC 19 37 21.8 +46 22 43   7.47 6.8     ~ 435 0
31 M 29 OpC 20 23 42.9 +38 29 25   7.30 6.6     ~ 256 0
32 NGC 7092 OpC 21 31 04.0 +48 17 47           ~ 245 0
33 NGC 7243 OpC 22 15 16.0 +49 50 07   6.54 6.4     ~ 133 0

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