2010A&A...518L.128V

Query : 2010A&A...518L.128V

2010A&A...518L.128V - Astronomy and Astrophysics, volume 518, L128-128 (2010/7-2)

Dust, Ice, and Gas In Time (DIGIT) Herschel program first results. A full PACS-SED scan of the gas line emission in protostar DK Chamaeleontis.

VAN KEMPEN T.A., GREEN J.D., EVANS II N.J., VAN DISHOECK E.F., KRISTENSEN L.E., HERCZEG G.J., MERIN B., LEE J.-E., JORGENSEN J.K., BOUWMAN J., ACKE B., ADAMKOVICS M., AUGEREAU J.-C., BERGIN E., BLAKE G.A., BROWN J.M., CARR J.S., CHEN J.-H., CIEZA L., DOMINIK C., DULLEMOND C.P., DUNHAM M.M., GLASSGOLD A., GUEDEL M., HARVEY P.M., HENNING T., HOGERHEIJDE M.R., JAFFE D., KIM H.J., KNEZ C., LACY J.H., MARET S., MEEUS G., MEIJERINK R., MULDERS G.D., MUNDY L., NAJITA J., OLOFSSON J., PONTOPPIDAN K.M., SALYK C., STURM B., VISSER R., WATERS L.B.F.M., WAELKENS C. and YILDIZ U.A.

Abstract (from CDS):

We aim to study the composition and energetics of the circumstellar material of DK Cha, an intermediate-mass star in transition from an embedded configuration to a star plus disk stage, during this pivotal stage of its evolution. Using the range scan mode of PACS on the Herschel Space Observatory, we obtained a spectrum of DK Cha from 55 to 210 µm as part of the DIGIT key program. Almost 50 molecular and atomic lines were detected, many more than the 7 lines detected in ISO-LWS. Nearly the entire ladder of CO from J=14-13 to 38-37 (E_u/k=4080K), water from levels as excited as J_K-1_K+1=7₀₇ (E_u/k=843K), and OH lines up to E_u/k=290K were detected. The continuum emission in our PACS SED scan matches the flux expected by a model consisting of a star, a surrounding disk of 0.03M_☉, and an envelope of a similar mass, supporting the suggestion that the object is emerging from its main accretion stage. Molecular, atomic, and ionic emission lines in the far-infrared reveal the outflow's influence on the envelope. The inferred hot gas may be photon-heated, but some emission may be caused by C-shocks in the walls of the outflow cavity.

Abstract Copyright: ∼

Journal keyword(s): astrochemistry - circumstellar matter - stars: formation - stars: protostars - infrared: ISM - submillimeter: ISM

Simbad objects: 5

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Number of rows : 5

N	Identifier	Otype	ICRS (J2000) RA	ICRS (J2000) DEC	Mag B	Mag V	Mag I	Sp type	#ref 1850 - 2023	#notes
1	NAME Orion Bright Bar	reg	05 35 22.30	-05 24 33.0				~	824	0
2	2MASS J08254384-5100326	Y*O	08 25 43.85	-51 00 32.7				~	313	1
3	HD 100546	Be*	11 33 25.4408872296	-70 11 41.241297948	6.71	6.30	6.64	A0VaekB8_lB	762	1
4	V* DK Cha	TT*	12 53 17.2111480272	-77 07 10.736046012				F0e	138	0
5	NAME Cha II	MoC	12 54	-77.2				~	323	0

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