2004A&A...428..569P


C.D.S. - SIMBAD4 rel 1.7 - 2020.01.21CET22:32:09

2004A&A...428..569P - Astronomy and Astrophysics, volume 428, 569-577 (2004/12-3)

X-ray emitting class I protostars in the Serpens dark cloud.

PREIBISCH T.

Abstract (from CDS):

We analyze a set of three individual XMM-Newton X-ray observation of the Serpens dark cloud. In addition to the 45 sources already reported in the analysis of the first of these XMM-Newton observations by Preibisch (2003A&A...410..951P), the complete combined data set leads to the detection of X-ray emission from four of the 19 known class I protostars in the region. The set of three observations allows us to study the variability of the sources on timescales from minutes to several months. The lightcurves of two of the four X-ray detected class I protostars show evidence for significant variability; the data suggest at least four flare-like events on these objects. This relatively high level of variability in the X-ray emission from the class I protostars is in qualitative agreement with the result by Imanishi et al. (2001ApJ...563..361I), who found that the class I protostars in the ρ Ophiuchi dark cloud show a higher level of variability than that of more evolved class II and class III young stellar objects. This may support non-coronal X-ray emission mechanisms for class I protostars and is in agreement with the predictions of models that assume magnetic interactions between the protostar and its surrounding disk as a source of high-energy emission. We also find a strong variation (by a factor of ∼10) in the X-ray luminosity of the class II object EC 74 between the three observations, which may be explained by a long duration flare or by rotational modulation. Finally, we find no evidence for X-ray emission from the five class 0 protostars in the region.

Abstract Copyright:

Journal keyword(s): open clusters and associations: stars: individual: Serpens cloud - stars: formation - stars: coronae - stars: pre-main sequence - X-rays: stars

Simbad objects: 13

goto Full paper

goto View the reference in ADS

Number of rows : 13

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 YLW 15 Y*O 16 27 26.93640 -24 40 50.8224           ~ 234 1
2 NAME Ophiuchus Molecular Cloud SFR 16 28 06 -24 32.5           ~ 2959 0
3 NAME Serpens Cloud SFR 18 29 49 +01 14.8           ~ 894 2
4 2MASS J18295571+0114315 Y*O 18 29 55.711 +01 14 31.50           ~ 37 0
5 2MASS J18295667+0112393 Y*O 18 29 56.674 +01 12 39.32           ~ 18 0
6 2MASS J18295751+0113492 Y*O 18 29 57.510 +01 13 49.25           ~ 9 0
7 2MASS J18295766+0113045 Y*O 18 29 57.661 +01 13 04.57           ~ 20 1
8 IRAS 18274+0112 Y*O 18 29 57.73680 +01 14 05.6940           M4: 132 2
9 2MASS J18295785+0112514 Y*O 18 29 57.858 +01 12 51.40           ~ 58 3
10 2MASS J18295876+0114257 Y*O 18 29 58.765 +01 14 25.78           ~ 24 1
11 GCNM 115 Y*O 18 29 59.02 +01 12 24.9           ~ 13 0
12 SSTc2d J182959.5+011159 cor 18 29 59.573 +01 11 58.39           ~ 22 0
13 SSTc2d J182959.9+011311 Y*O 18 29 59.92 +01 13 11.6           ~ 15 1

    Equat.    Gal    SGal    Ecl

To bookmark this query, right click on this link: simbad:objects in 2004A&A...428..569P and select 'bookmark this link' or equivalent in the popup menu


2020.01.21-22:32:09

© Université de Strasbourg/CNRS

    • Contact