2016A&A...595A..22R

Query : 2016A&A...595A..22R

2016A&A...595A..22R - Astronomy and Astrophysics, volume 595A22-22 (2016/11-1)

Nine new open clusters within 500 pc from the Sun.

ROSER S., SCHILBACH E. and GOLDMAN B.

Abstract (from CDS):

Aims. One of the results of the Milky Way Star Clusters (MWSC) survey was the detection of a slight under-density of old (ca. 1Gyr) clusters within the nearest kilo-parsec from the Sun. This under-density may be due to an ineffectiveness in the detection of larger structures with lower surface brightness. We report on our attempts to reveal such clusters.
Methods. We derived proper motions from a combination of Tycho-2 with URAT1, and obtained a mean precision of about 1.4mas/yr per co-ordinate for 1.3 million stars north of -20° declination. We cut the sky into narrow proper motion slices and searched for spatial over-densities of stars in each slice. We then examined stars from over-densities in optical and near-infrared colour-magnitude diagrams to determine if they are compatible with isochrones of a cluster. We estimated the field star contamination using our data and the Besancon Galactic model.
Results. We detected nine hitherto unknown open clusters in the vicinity of the Sun with ages between 70Myr and 1Gyr, and distances between 200 and 500pc.

Abstract Copyright: © ESO 2016

Journal keyword(s): open clusters and associations: general - catalogs - surveys - proper motions

VizieR on-line data: <Available at CDS (J/A+A/595/A22): table1.dat>

Nomenclature: Table 1: RSGN (Nos 1-9).

Simbad objects: 22

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Number of rows : 22
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 NGC 752 OpC 01 56 53.7 +37 45 06           ~ 712 0
2 Cl Melotte 22 OpC 03 46 38.0 +24 10 41           ~ 3679 0
3 Cl Melotte 25 OpC 04 30 27.4 +16 46 43           ~ 3309 0
4 RSG 9 OpC 04 51 +52.2           ~ 2 0
5 Cl Alessi 96 OpC 05 02 07.1 +37 30 41           ~ 30 0
6 HD 32270 * 05 03 38.2571168064 +37 16 06.755807568   7.41 7.31     B8 26 0
7 RSG 2 OpC 07 22 +54.9           ~ 5 0
8 * 19 Lyn B * 07 22 50.8494933024 +55 17 03.549766308   6.67 6.72     B9V 56 0
9 * 19 Lyn A SB* 07 22 52.0583392848 +55 16 53.017263336   5.69 5.78     B8V 82 0
10 HD 70358 * 08 21 15.5792659944 -08 03 28.333518012   8.57 7.27     K1III 14 0
11 HD 70407 * 08 21 32.5607501064 -08 11 30.401702592   8.88 7.77     K0III 14 0
12 RSG 3 OpC 08 24 -08.8           ~ 3 0
13 HD 180007 * 19 11 34.3793730216 +56 26 40.113741732   8.78 8.72     A0 23 0
14 RSG 4 OpC 19 14 +57.0           ~ 5 0
15 NGC 6774 OpC 19 16 17.6 -16 20 45           ~ 258 0
16 * 31 Cyg SB* 20 13 37.9082370480 +46 44 28.761618048 5.50 5.08 3.80 2.83 2.07 K3Ib+B2IV-V 385 0
17 RSG 5 OpC 20 14 13.9 +45 34 26           ~ 43 0
18 HD 194789 * 20 26 03.8581365936 +40 24 06.132817332   6.527 6.636     B8 27 0
19 Cl Roslund 6 OpC 20 29 00.4 +40 01 11           ~ 66 0
20 RSG 6 OpC 20 30 +40.1           ~ 4 0
21 RSG 7 OpC 22 56 51.0 +59 26 36           ~ 34 0
22 RSG 8 OpC 22 58 57.1 +59 23 34           ~ 35 0

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