2012A&A...538A..64C


C.D.S. - SIMBAD4 rel 1.7 - 2019.07.24CEST03:52:51

2012A&A...538A..64C - Astronomy and Astrophysics, volume 538A, 64-64 (2012/2-1)

POISSON project. II. A multi-wavelength spectroscopic and photometric survey of young protostars in L1641.

CARATTI O GARATTI A., GARCIA LOPEZ R., ANTONIUCCI S., NISINI B., GIANNINI T., EISLOEFFEL J., RAY T.P., LORENZETTI D. and CABRIT S.

Abstract (from CDS):

Characterising stellar and circumstellar properties of embedded young stellar objects (YSOs) is mandatory for understanding the early stages of the stellar evolution. This task requires the combination of both spectroscopy and photometry, covering the widest possible wavelength range, to disentangle the various protostellar components and activities. As part of the POISSON project (Protostellar Optical-Infrared Spectral Survey On NTT), we present a multi-wavelength spectroscopic and photometric investigation of embedded YSOs in L1641, aimed to derive the stellar parameters and evolutionary stages and to infer their accretion properties. Our multi-wavelength database includes low-resolution optical-IR spectra from the NTT and Spitzer (0.6-40µm) and photometric data covering a spectral range from 0.4 to 1100µm, which allow us to construct the YSOs spectral energy distributions (SEDs) and to infer the main stellar parameters (visual extinction, spectral type, accretion, stellar, bolometric luminosity, mass accretion, and ejection rates). The NTT optical-NIR spectra are rich in emission lines, which are mostly associated with YSO accretion, ejection, and chromospheric activities. A few emission lines, prominent ice (H2O and CO2), and amorphous silicate absorption features have also been detected in the Spitzer spectra. The SED analysis allows us to group our 27 YSOs into nine Class I, eleven Flat, and seven Class II objects. However, on the basis of the derived stellar properties, only six Class I YSOs have an age of ∼105yr, while the others are older (5x105-106yr), and, among the Flat sources, three out of eleven are more evolved objects (5x106-107yr), indicating that geometrical effects can significantly modify the SED shapes. Inferred mass accretion rates ({dot}(M)acc) show a wide range of values (3.6x10–9 to 1.2x10–5M/yr), which reflects the age spread observed in our sample well. Average values of mass accretion rates, extinction, and spectral indices decrease with the YSO class. The youngest YSOs have the highest {dot}(M)acc, whereas the oldest YSOs do not show any detectable jet activity in either images and spectra. Apart from the outbursting source #25 and, marginally, #20, none of the remaining YSOs is accretion-dominated (Lacc>L*). We also observe a clear correlation among the YSO {dot}(M)acc, M*, and age. For YSOs with t>105yr and 0.4M≤M*≤1.2M, a relationship between {dot}(M)acc and t ({dot}(M)acc ∝t–1.2) has been inferred, consistent with mass accretion evolution in viscous disc models and indicating that the mass accretion decay is slower than previously assumed. Finally, our results suggest that episodic outbursts are required for Class I YSOs to reach typical classical T Tauri stars stellar masses.

Abstract Copyright:

Journal keyword(s): stars: evolution - accretion, accretion disks - stars: formation - ISM: jets and outflows - surveys - infrared: stars

Simbad objects: 45

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Number of rows : 45

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2019
#notes
1 NAME Auriga reg 04 20 00.0 +38 05 00           ~ 161 0
2 NAME Taurus Dark Cloud SFR 04 41.0 +25 52           ~ 3267 0
3 HD 33208 * 05 08 33.3042928015 -03 00 34.593240971   7.79 7.23     F8/G0(V) 20 0
4 NAME HH 240/241 DNe 05 19 48.9 -05 52 05           ~ 104 1
5 NAME Orion Nebula Cluster OpC 05 35.0 -05 29           ~ 1886 1
6 V* V823 Ori Or* 05 36 06.6536823689 -06 32 17.149058870     16.921   14.217 K5 16 0
7 2MASS J05362513-0644418 Y*O 05 36 25.1312112025 -06 44 41.842095753     18.160   14.634 K4.5 50 0
8 BD-06 1253 Ae* 05 36 25.43150 -06 42 57.6855   11.65 10.9 10.29   A1e 398 2
9 V* V846 Ori TT* 05 36 41.3689627265 -06 34 00.750112925     14.315   12.462 M0 32 0
10 2MASS J05372447-0658329 Y*O 05 37 24.4768626806 -06 58 32.904404770           K5 16 0
11 2MASS J05380752-0708291 Y*O 05 38 07.525 -07 08 29.20           K7 37 0
12 Parenago 2649 Ae* 05 38 09.3040922103 -06 49 16.597267355   15.37 13.75 12.85   A5e 47 0
13 V* V883 Ori FU* 05 38 18.0974260202 -07 02 25.963144400   14.80       F:I: 93 1
14 IC 430 ISM 05 38 18.24 -07 02 26.2     14.4     ~ 58 1
15 Haro 4-254 pr* 05 38 52.3773209863 -07 21 09.294328642   16.5 15.712   12.743 G4.3 25 0
16 LDN 1641 MoC 05 39.0 -07 00           ~ 416 0
17 [MB91] 31 pr* 05 39 05.3710430611 -07 11 05.150904914     19.862   15.708 M0.2 17 0
18 Haro 4-255 pr* 05 39 22.3406615735 -07 26 44.483472198   15 15.830   12.969 K0 90 0
19 IRAS 05377-0733 pr* 05 40 13.7885047868 -07 32 16.017575810     21.389   16.242 M7.5 10 0
20 2MASS J05401494-0748485 Y*O 05 40 14.950 -07 48 48.52           M1 5 0
21 IRAS 05378-0750 * 05 40 16.7 -07 48 33           K7 21 0
22 IRAS 05379-0815 * 05 40 19.8 -08 14 08           K7 12 0
23 V* V1791 Ori Or* 05 40 37.3591178327 -08 04 03.017021735     11.55   11.822 F 24 0
24 NAME Ori GMC MoC 05 41 -01.1           ~ 38 0
25 IRAS 05389-0759 Y*O 05 41 22.131 -07 58 03.04           K5 13 0
26 V* DL Ori Em* 05 41 25.3543568979 -08 05 54.724911984     12.00     K1 47 0
27 2MASS J05413005-0840092 Y*O 05 41 30.052 -08 40 09.21           M0 8 0
28 IRAS 05391-0841 IR 05 41 30.297 -08 40 16.57           ~ 9 0
29 2MASS J05413033-0840177 Y*O 05 41 30.336 -08 40 17.72           M0 6 0
30 IRAS 05391-0805 * 05 41 30.5 -08 03 38           K5 11 0
31 2MASS J05413418-0835273 Y*O 05 41 34.181 -08 35 27.33           M0 6 0
32 IRAS 05391-0836 * 05 41 34.9 -08 35 25           M0 10 0
33 2MASS J05424706-0817069 Y*O 05 42 47.067 -08 17 06.93           M5 47 0
34 [BDB2003] G212.98-19.15 Cl* 05 42 50.1 -08 38 37           ~ 4 0
35 IRAS 05404-0841 * 05 42 51.5 -08 40 01           K6 7 0
36 V* V1647 Ori FU* 05 46 13.1370923766 -00 06 04.876812846     18.1     ~ 220 1
37 HD 289002 * 06 45 13.3726265810 +02 08 14.688016523 10.06 10.62 10.44     B1 219 0
38 NAME Vela XYZ Rad 08 34.0 -45 50           ~ 1081 2
39 NAME Cha I MoC 11 06 48 -77 18.0           ~ 923 1
40 NAME Cha II MoC 12 54 -77.2           ~ 292 0
41 NAME Lup Cloud SFR 16 03 -38.1           ~ 474 0
42 NAME Ophiuchus Molecular Cloud SFR 16 28 06 -24 32.5           ~ 2905 0
43 NAME Serpens Cloud SFR 18 29 49 +01 14.8           ~ 871 2
44 NAME CrA Dark Cloud MoC 19 01 51 -36 58.9           ~ 383 0
45 Ass Cep OB 2 As* 21 51 +60.0           ~ 276 0

    Equat.    Gal    SGal    Ecl

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2019.07.24-03:52:51

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