A study of the Chamaeleon star-forming region from the ROSAT All-Sky Survey. II. The pre-main sequence population.

Details A study of the Chamaeleon star-forming region from the ROSAT All-Sky Survey. II. The pre-main sequence population. A study of the Chamaeleon star-forming region from the ROSAT All-Sky Survey. II. The pre-main sequence population.

Mar 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997a%26a...319..184a&link_type=abstract

Astronomy and Astrophysics, v.319, p.184-200

Astronomy and Astrophysics

Astrophysics

81

X-Ray: Stars, Stars: Pre-Main-Sequence, Activity, Ism: Chamaeleon Clouds, Surveys

Scientific paper

We analyse the nature of the optical counterparts of the ROSAT all-sky survey (RASS) X-ray sources identified with new weak-line T Tauri (WTTS) stars in the Chamaeleon star forming region (SFR). The new WTTS are distributed throughout the whole SFR, while the classical T Tauri stars (CTTS) are found only in the cloud cores. Adopting a distance of 150pc we derive the stellar parameters and place the new WTTS in the HR diagram. By comparison with theoretical pre-main sequence (PMS) evolutionary tracks, we find masses in the range of 0.2-2.5Msun_ and ages from a few 10^5^yr to 5x10^7^yr. Many of the youngest WTTS are located far away from the main Chamaeleon dark clouds. By comparing the properties of the new WTTS with those of the previously known Chamaeleon members, we obtain the following results: i) the new WTTS are, on average, the more massive and luminous PMS stars in Chamaeleon, while the Cha II population contains the lower-mass PMS stars; ii) for stellar masses between 2.5 and 0.5Msun_, the combined mass distribution of the PMS stars is consistent with the initial mass function (IMF) for field stars, but declines rapidly for masses between 0.5 and 0.1Msun_, where the strongest selection effects are expected; iii) a weak trend for increasing age with increasing angular distance from the cloud cores is observed but we cannot establish an age segregation since very young WTTS are also found far away from the molecular clouds; iv) the age distributions of the new WTTS and the Cha I population are nearly identical, while that of the Cha II population is shifted towards younger stars indicating that Cha II is probably in an earlier evolutionary phase as compared with Cha I and the new WTTS; v) no decrease of the number density of WTTS is observed with increasing distance to the clouds; vi) the level of X-ray emission of the new WTTS is higher than that of the previously known Chamaeleon members, and the fraction of energy released as X-ray emission, is higher in the new WTTS than in the Cha I TTS. The latter is similar to the X-ray emission level found in open clusters. Finally, we discuss possible mechanisms which may give rise to the observed spatial distribution of the PMS stars in Chamaeleon.

Affiliated with

Also associated with

No associations

Rating

A study of the Chamaeleon star-forming region from the ROSAT All-Sky Survey. II. The pre-main sequence population. 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 study of the Chamaeleon star-forming region from the ROSAT All-Sky Survey. II. The pre-main sequence population., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and A study of the Chamaeleon star-forming region from the ROSAT All-Sky Survey. II. The pre-main sequence population. will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1857761