A near-infrared survey for new low-mass members in Alpha Per

Details A near-infrared survey for new low-mass members in Alpha Per A near-infrared survey for new low-mass members in Alpha Per

2005-02-22

arxiv.org/abs/astro-ph/0502446v1

Astronomy and Astrophysics

Astrophysics

13 pages, 10 figures, 3 tables and 1 electronic table, accepted for publication in A&A

Scientific paper

10.1051/0004-6361:20042048

We present a near-infrared (K'-band) survey of 0.7 square degree area in the Alpha Persei open cluster (age = 90 Myr, distance = 182 pc) carried out with the Omega-Prime camera on the Calar Alto 3.5-m telescope. Combining optical data (Rc and Ic) obtained with the KPNO/MOSA detector and presented in Stauffer et al. (1999) with the K' observations, a sample of new candidate members has been extracted from the optical-infrared colour-magnitude diagram. The location of these candidates in the colour-colour diagram suggests that two-thirds of them are actually reddened background giants. About 20 new candidate members with masses between 0.3 and 0.04 Msun are added to the 400 known Alpha Per cluster members. If they are indeed Alpha Per members, four of the new candidates would be brown dwarfs. We discuss the advantages and drawbacks of the near-infrared survey as compared to the optical selection method. We also describe the outcome of optical spectroscopy obtained with the Twin spectrograph on the Calar Alto 3.5-m telescope for about 30 candidates, including selected members from the optical sample presented in Barrado y Navascues et al. (2002) and from our joint optical/infrared catalogue. These results argue in favour of the optical selection method for this particular cluster.

Affiliated with

Also associated with

No associations

Rating

A near-infrared survey for new low-mass members in Alpha Per does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with A near-infrared survey for new low-mass members in Alpha Per, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and A near-infrared survey for new low-mass members in Alpha Per will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-471271