2006A&A...457L..29H


C.D.S. - SIMBAD4 rel 1.7 - 2021.04.16CEST18:33:09

2006A&A...457L..29H - Astronomy and Astrophysics, volume 457, L29-32 (2006/10-3)

2.3 µm CO emission and absorption from young high-mass stars in M 17.

HOFFMEISTER V.H., CHINI R., SCHEYDA C.M., NUERNBERGER D., VOGT N. and NIELBOCK M.

Abstract (from CDS):

We are studying the extremely young cluster of M17 to investigate the birth of high-mass stars and the initial mass function. Deep JHKL imaging and K-band spectroscopy from the VLT of 201 stars toward the cluster is presented. The majority of 104 stars show the CO band-head in absorption. Half of them emit X-rays and/or have infrared excess, indicative of very young objects. Their intrinsic IR luminosity is compatible with intermediate and high-mass pre-main sequence stars. Nine additional stars have the CO feature in emission, while sixty sources are lacking any stellar spectral feature due to veiling by circumstellar dust. We suggest that CO absorption is - as in the case of low-mass stars - also a common feature during the early evolution of stars with higher masses. According to model calculations the observed CO absorption is most likely a sign of heavily accreting protostars with mass accretion rates above 10–5M/yr.

Abstract Copyright:

Journal keyword(s): infrared: stars - ISM: HII regions - Galaxy: open clusters and associations: individual: M 17 - Galaxy: open clusters and associations: individual: NGC 6618 - stars: early-type - stars: circumstellar matter

Simbad objects: 14

goto Full paper

goto View the reference in ADS

Number of rows : 14

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 Cl* NGC 6618 B 339 * 18 20 21.23 -16 09 41.2           ~ 3 0
2 Cl* NGC 6618 B 337 * 18 20 21.43 -16 10 41.2           ~ 13 0
3 Cl* NGC 6618 B 331 * 18 20 21.6390459226 -16 11 17.903412803           B0V 18 0
4 Cl* NGC 6618 B 324 * 18 20 22.0618087002 -16 09 19.046233234           B2V 9 0
5 Cl* NGC 6618 B 305 * 18 20 23.05 -16 07 58.9           O5V 10 0
6 Cl* NGC 6618 B 275 * 18 20 25.17 -16 10 26.7     15.6     B2V 21 0
7 Cl* NGC 6618 B 268 * 18 20 25.41 -16 10 19.2   18.4 17.1     B2 16 0
8 2MASS J18202544-1611155 Y*O 18 20 25.4449566437 -16 11 15.409133969   18.0 15.9     B1V 9 0
9 Cl* NGC 6618 B 239 * 18 20 27.10 -16 11 22.1           ~ 3 0
10 2MASS J18202868-1609262 Y*O 18 20 28.6777781472 -16 09 26.099124271   19.0 17.7     ~ 9 0
11 2MASS J18203095-1610393 Y*O 18 20 30.954 -16 10 39.36           kA5 7 0
12 Cl* NGC 6618 B 120 * 18 20 33.89 -16 08 10.8           ~ 3 0
13 Cl* NGC 6618 B 22 * 18 20 41.76 -16 07 55.9           ~ 3 0
14 NGC 6618 OpC 18 20 47 -16 10.3           ~ 1514 0

    Equat.    Gal    SGal    Ecl

To bookmark this query, right click on this link: simbad:objects in 2006A&A...457L..29H and select 'bookmark this link' or equivalent in the popup menu


2021.04.16-18:33:09

© Université de Strasbourg/CNRS

    • Contact