2008A&A...483..253M


C.D.S. - SIMBAD4 rel 1.7 - 2020.04.04CEST23:42:17

2008A&A...483..253M - Astronomy and Astrophysics, volume 483, 253-262 (2008/5-3)

RACE-OC project: rotation and variability in the open cluster NGC 2099 (M 37).

MESSINA S., DISTEFANO E., PARIHAR P., KANG Y.B., KIM S.-L., REY S.-C. and LEE C.-U.

Abstract (from CDS):

Rotation and solar-type magnetic activity are closely related to each other in main-sequence stars of G or later spectral types. The presence and level of magnetic activity depend on star's rotation, and rotation itself is strongly influenced by strength and topology of the magnetic fields. Open clusters represent especially useful targets to investigate the connection between rotation and activity. The open cluster NGC 2099 has been studied as a part of the RACE-OC project (Rotation and ACtivity Evolution in Open Clusters), which is aimed at exploring the evolution of rotation and magnetic activity in the late-type members of open clusters of different ages. We collected time series CCD photometric observations of this cluster in January 2004, and we determined the presence of periodicities in the flux variation related to the stellar rotation by Fourier analysis. We investigate the relations between activity manifestations, such as the light curve amplitude, and global stellar parameters. We have discovered 135 periodic variables, 122 of which are candidate cluster members. Determination of rotation periods of G- and K-type stars has allowed us to better explore the evolution of angular momentum at an age of about 500Myr. In our analysis, we have also identified 3 new detached eclipsing binary candidates among cluster members. A comparison with the older Hyades cluster (∼625Myr) shows that the newly-determined distribution of rotation periods is consistent with the scenario of rotational braking of main-sequence spotted stars as they age. However, a comparison with the younger M 34 cluster (∼200Myr) shows that the G8-K5 members of these clusters have the same rotation period distribution. That is, G8-K5 members in NGC 2099 seem to have experienced no significant braking in the age range from ∼200 to ∼500Myr. Finally, NGC 2099 members have a smaller level of photospheric magnetic activity, as measured by light curve amplitude, than in younger stars of the same mass and rotation, suggesting that the activity level also depends on some other age-dependent parameters.

Abstract Copyright:

Journal keyword(s): stars: activity - stars: binaries: close - stars: late-type - stars: rotation - stars: starspots - Galaxy: open clusters and associations: individual: NGC 2099

VizieR on-line data: <Available at CDS (J/A+A/483/253): table1.dat table2.dat table3.dat>

Nomenclature: Table 1: Cl* NGC 2099 MDP NNNN N=153 among (Nos 59-7941).

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

Simbad objects: 21

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Number of rows : 21

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 NGC 1039 OpC 02 42 05 +42 45.7           ~ 368 0
2 Cl Melotte 22 OpC 03 47 00 +24 07.0           ~ 2948 0
3 Cl Melotte 25 OpC 04 26 54.00 +15 52 00.0           ~ 2624 0
4 NAME Orion Nebula Cluster OpC 05 35.0 -05 29           ~ 1943 1
5 2MASS J05512935+3224179 WU* 05 51 29.36 +32 24 17.9   18.461 17.648   16.620 ~ 4 0
6 [CBH2015] V24 WU* 05 51 34.4475960814 +32 29 06.154647072   21.781 20.506   18.988 ~ 4 0
7 V* V539 Aur dS* 05 51 50.5331439551 +32 32 34.806055194   16.868 16.05   15.371 ~ 7 0
8 2MASS J05520049+3236481 WU* 05 52 00.4942848737 +32 36 48.176449631   15.011 14.561     ~ 5 0
9 [CBH2015] V11 dS* 05 52 03.3838718313 +32 35 13.720174880   15.809 15.419   14.630 ~ 5 0
10 [CBH2015] V17 dS* 05 52 11.0024892160 +32 41 45.023019660   18.068 17.325     ~ 5 0
11 V* V540 Aur Al* 05 52 16.5886719852 +32 28 15.171200136   15.341 14.653     ~ 9 0
12 M 37 OpC 05 52 18 +32 33.2   6.19 5.6     ~ 331 2
13 V* V541 Aur Al* 05 52 20.3943101646 +32 33 19.755549225   14.015 13.406     ~ 8 0
14 V* V542 Aur EB* 05 52 33.0181240686 +32 32 41.943873613   16.779 16.051   15.025 F2-F0 10 0
15 V* V543 Aur EB* 05 52 39.0968387614 +32 36 31.220063252   18.705 17.890     ~ 7 0
16 Cl* NGC 2099 KV 14 WU* 05 52 40.690 +32 24 24.43   19.131 18.053     ~ 5 0
17 Cl* NGC 2099 KV 16 WU* 05 52 43.8882199796 +32 28 52.572185919   21.298 20.433     ~ 3 0
18 V* V544 Aur EB* 05 52 53.2668999555 +32 33 01.500713345   16.886 16.17   14.714 ~ 8 0
19 V* V545 Aur dS* 05 53 00.6382666206 +32 24 50.799849854   16.769 16.11   14.990 ~ 8 0
20 2MASS J05530349+3232143 WU* 05 53 03.5028951584 +32 32 14.232695929   19.574 18.540     ~ 5 0
21 [CBH2015] V2256 dS* 05 53 10.4365673168 +32 33 47.429194519   15.293 14.762     ~ 3 0

    Equat.    Gal    SGal    Ecl

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2020.04.04-23:42:17

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