1997A&AS..122...95C


Query : 1997A&AS..122...95C

1997A&AS..122...95C - Astron. Astrophys., Suppl. Ser., 122, 95-109 (1997/April-1)

Optical polarimetry, high-resolution spectroscopy and IR analysis of the Chamaeleon I dark cloud.

COVINO E., PALAZZI E., PENPRASE B.E., SCHWARZ H.E. and TERRANEGRA L.

Abstract (from CDS):

We present optical polarimetry and high resolution spectroscopy of a sample of stars toward the Chamaeleon I dark cloud. We use our polarimetry which includes 33 stars to study the wavelength dependence of the degree and position angle of polarization. From fits to the normalized wavelength dependence of interstellar polarization, we derive estimates of λMax ranging from 4500Å to 6700Å, and PMax ranging from 3 to 8%. The values of λMax were found to be well correlated with the IRAS 100µm intensity, while PMax was found to increase with EB–V. High resolution spectra of the Ca II, CH, and CH+ lines were obtained for 10 stars, which show two components of Ca II in absorption at 3.0<vLSR<5km/s, and vLSR=-3.0km/s and a single strong molecular CH absorption component at 3.0<vLSR<5.0km/s. From our data we found, by interpretation of the various correlations between the polarimetry, photometry and IRAS fluxes, the following: the probable presence of shocked molecular gas; a warm molecular CH component; small dust grains at the edges of the cloud, and larger grains in the central parts, which are causing the polarization. Our results provide a consistent picture of the gas and dust content in the Cha I region, where larger grains, responsible of the starlight polarization, exist in the center of the cloud, surrounded by envelopes of warmer molecular and atomic material.

Abstract Copyright:

Journal keyword(s): ISM: chamacleon clouds - dust, extinction - atoms - molecules - polarization - infrared: ISM: continuum

Simbad objects: 39

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Number of rows : 39
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 CD-76 476 * 10 49 01.3667034792 -76 54 27.923331384   11.74 10.13     K4III 10 0
2 CD-77 469 * 10 50 36.8817641736 -77 58 05.433237984   10.43 9.88     B8V 10 0
3 HD 94414 * 10 50 55.9434064368 -77 07 28.547261652   8.43 8.01     B4V 37 0
4 TYC 9410-368-1 * 10 55 48.6112150560 -76 51 50.571981612   11.63 11.02     A2V 11 0
5 CD-75 514 * 10 56 11.4552577200 -76 35 52.873560780   10.64 10.39     B5V 13 0
6 CD-76 481 PM* 10 59 04.2213417600 -77 05 57.118216236   11.11 9.48     K0III 13 0
7 Glass K * 11 01 00.0687422664 -77 38 51.715057740   15.87 13.77 13.43 11.25 K3III 7 0
8 CD-75 518 * 11 01 14.0901663072 -76 32 26.699465040   11.23 10.64     B9V 10 0
9 Glass C TT* 11 03 11.5657030464 -77 21 04.321403100   12.59 11.48     G2V 28 0
10 Glass L * 11 03 22.8784151400 -77 41 30.191355132     15.22   12.28 G8III 7 0
11 Glass T * 11 04 07.9525454400 -76 52 12.841693392   13.346 11.408 10.841 9.41 K3III 14 0
12 Glass D * 11 04 16.8700433328 -77 17 38.674737204     14.10 13.65 11.66 G8III 6 0
13 Glass E * 11 04 48.9948802632 -77 16 26.172269832   15.702 13.040 12.38 9.28 M5III 11 0
14 IRAS 11042-7552 FIR 11 05 47.8 -76 08 44           ~ 1 0
15 HD 96675 Y*O 11 05 57.8105960448 -76 07 48.884316960   7.82 7.68   8.48 B6IV/V 73 0
16 NAME Cha 1 MoC 11 06 48 -77 18.0           ~ 1058 1
17 Glass B * 11 06 58.5373011096 -77 13 32.422795068   15.336 12.921 12.52 9.85 G8III 13 0
18 Glass G * 11 07 16.5157616040 -77 26 21.428716200     15.14     K4III 10 0
19 RX J1108.2-7728 Y*O 11 07 55.775088 -77 27 25.52724   15.26 13.40 13.07 11.04 K3Ve 53 0
20 HD 97048 Ae* 11 08 03.3109731720 -77 39 17.490777444 9.03 8.76 9.00   8.64 A0Vep 497 0
21 BRAN 341B RNe 11 08 03.4 -77 39 19           ~ 27 0
22 Glass A * 11 08 25.7675857440 -76 48 31.547398464   13.130 11.353     K3III 18 0
23 HD 97300 Ae* 11 09 50.0199904704 -76 36 47.718191232   9.41 9.20   8.82 B9V 164 1
24 Ced 112 RNe 11 09 52.4 -76 36 57           ~ 31 0
25 Glass O * 11 09 53.1585133536 -77 45 40.076642376   17.41 15.06 14.93 12.54 G8III 10 0
26 Glass Q Y*O 11 10 37.8987149352 -77 32 39.881630256   16.89 14.97   11.90 K5.5+K7 67 0
27 Glass P * 11 11 13.3178632584 -77 31 17.928839820     13.76 13.49 10.69 K0III 13 0
28 CD-75 528 * 11 13 31.9410023760 -76 03 24.418860768   10.82 9.60     G9III 8 0
29 CD-76 489 * 11 15 09.8777 -77 02 15.748     9.5     K3III 9 0
30 HD 98143 * 11 15 16.9024812240 -77 31 06.120737796   8.12 7.61     B8III 37 0
31 HD 98294 * 11 16 38.8117021920 -75 13 19.248213216   8.69 8.52     B8V 14 0
32 HD 98561 * 11 18 44.1047607888 -75 24 58.326718356   8.78 8.35     A3/4IV 12 0
33 HD 98627 * 11 19 03.8021619480 -75 49 29.620662708   9.10 7.38     K5III 16 0
34 HD 98672 * 11 19 36.5281546752 -75 08 32.808187176   6.241 6.258     B9.5/A0V 27 0
35 HD 99015 PM* 11 21 56.8916592888 -77 36 30.127445856   6.624 6.423     A5III/IV 23 0
36 HD 99161 * 11 23 06.9016750536 -76 00 26.979856668   9.01 8.89     B9.5V 16 0
37 HD 99515 * 11 25 18.8461162920 -77 42 01.421959968   9.77 9.35     A8IV 14 0
38 HD 99759 * 11 27 16.1203186872 -75 56 02.256217872   8.75 8.51     B9.5V 22 0
39 HD 100401 * 11 31 55.2985117488 -76 18 11.407953744   9.47 8.38     G6III/IV 16 0

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2022.05.20-00:49:24

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