ar X iv : 0 70 4 . 04 28 v 1 [ as tr o - ph ] 3 A pr 2 00 7 Star Formation in the Bok Globule CB 54
نویسنده
چکیده
We present mid-infrared (10.4 μm, 11.7 μm, and 18.3 μm) imaging intended to locate and characterize the suspected protostellar components within the Bok globule CB54. We detect and confirm the protostellar status for the near-infrared source CB54YC1-II. The mid-infrared luminosity for CB54YC1-II was found to be Lmidir ≈ 8 L⊙, and we estimate a central source mass of M∗ ≈ 0.8 M⊙ (for a mass accretion rate of Ṁ = 10 M⊙ yr ). CB54 harbors another near-infrared source (CB54YC1-I), which was not detected by our observations. The nondetection is consistent with CB54YC1-I being a highly extinguished embedded young A or B star or a background G or F giant. An alternative explanation for CB54YC1-I is that the source is an embedded protostar viewed at an extremely high inclination angle, and the near-infrared detections are not of the central protostar, but of light scattered by the accretion disk into our line of sight. In addition, we have discovered three new mid-infrared sources, which are spatially coincident with the previously known dense core in CB54. The source temperatures (∼ 100K) and association of the mid-infrared sources with the dense core suggests that these mid-infrared objects may be embedded class 0 protostars. Subject headings: infrared: ISM — infrared: stars — ISM: globules — ISM: individual (CB54, LBN 1042) — stars: formation — stars: pre–main-sequence
منابع مشابه
ar X iv : 0 70 4 . 28 88 v 2 [ as tr o - ph ] 1 0 M ay 2 00 7 The Extragalactic γ Ray Background
One way to understand the nonthermal history of the universe is by establishing the origins of the unresolved and truly diffuse extragalactic γ rays. Dim blazars and radio/γ galaxies certainly make an important contribution to the galactic γ-ray background given the EGRET discoveries, and previous treatments are reviewed and compared with a new analysis. Studies of the γ-ray intensity from cosm...
متن کاملar X iv : 0 70 5 . 31 13 v 1 [ as tr o - ph ] 2 2 M ay 2 00 7 Dynamics and planet formation in / around binaries
1 Dipartimento di Fisica, Via Marzolo 8, 35131 Padova, Italy [email protected] 2 Observatoire de Paris, Section de Meudon, F-92195 Meudon Principal Cedex, France [email protected] 3 Stockholm Observatory, Albanova Universitetcentrum, SE-10691 Stockholm, Sweden [email protected] 4 Planetary Science Institute, Tucson, Arizona [email protected] 5 Observatoire de la Côte d’Azur, Nice, F...
متن کاملar X iv : 0 70 8 . 26 18 v 1 [ as tr o - ph ] 2 0 A ug 2 00 7 Using Local Volume data to constrain Dark Matter dynamics
متن کامل
ar X iv : 0 70 7 . 43 64 v 1 [ as tr o - ph ] 3 0 Ju l 2 00 7 The distribution of H 13 CN in the circumstellar envelope around IRC + 10216
HCN J =8→ 7 sub-millimetre line emission produced in the circumstellar envelope around the extreme carbon star IRC+10216 has been imaged at sub-arcsecond angular resolution using the SMA. Supplemented by a detailed excitation analysis the average fractional abundance of HCN in the inner wind (. 5× 10 cm) is estimated to be about 4× 10, translating into a total HCN fractional abundance of 2× 10 ...
متن کامل