The nature of V645 Cygni = CRL 2789

Cohen, Marc M.

doi:10.1086/155386

Cited by 23 publications

(28 citation statements)

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“…2, the Brackett series hydrogen recombination lines show P-Cygni profiles. Such line profiles have previously been observed in optical hydrogen lines (Cohen 1977;Hamann & Persson 1989;Goodrich 1986), however the velocities implied are nearly double that previously observed. The blue absorption wing extends to velocities of nearly −2000 km s −1 .…”

Section: Hydrogensupporting

confidence: 75%

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Evidence for variable outflows in the young stellar object V645 Cygni

Clarke

Lumsden

Oudmaijer

et al. 2006

A&A

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Aims. As part of the Red MSX Source Survey of Massive Young Stellar Objects (MYSOs) we have conducted multi-wavelength follow up observations of the well-known object V645 Cygni. We present our data on this object, whose near-infrared spectrum is exceptional and place these in context with previous observations Methods. Our observations of V645 Cyg included near/mid infrared imaging observations, 13 CO 2−1 line observations and high signal-to-noise velocity resolved near-infrared spectroscopy.Results. The spectrum shows P-Cygni hydrogen Brackett emission, consistent with a high velocity stellar wind. A red-shifted emission component to a number of near-IR emission lines was also uncovered. This is associated with a similar component in the Hα line. V645 Cyg is also found to have variable CO first overtone bandhead emission. Conclusions. The data clearly indicate that the outflow of V645 Cyg is variable. The unidentified feature in a previously published optical spectrum is identified with a receding outflow at 2000 km s −1 . The nature of this feature, which is found in hydrogen and helium atomic lines and CO molecular lines remains a puzzle.

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Section: Hydrogensupporting

confidence: 75%

“…The optical follow up observations of Cohen (1977) revealed the star to be a young O7e type star within a polarised optical nebula. The presence of P-Cygni profile hydrogen recombination lines in the optical spectrum was interpreted as evidence for a stellar wind with velocities as high as 1000 km s −1 .…”

Section: Introductionmentioning

confidence: 94%

Evidence for variable outflows in the young stellar object V645 Cygni

Clarke

Lumsden

Oudmaijer

et al. 2006

A&A

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“…Di Francesco et al (1997) refer of a possible detection at 2.7 mm with the Plateau de Bure interferometer. In the radio continuum (3.6 cm; Skinner et al 1993) the emission is extended, with an intensity consistent with the O7 classification of Cohen (1977).…”

Section: Cyg (Afgl 2798)supporting

confidence: 66%

“…The distance (6 kpc) and the spectral type are from Cohen (1977). There is some controversy on the actual values of the parameters for this star, which Far-infared studies of this region (Natta et al 1993) reveal extended emission at 50 and 100 µm, typical of an extended envelope surrounding the star.…”

Section: Cyg (Afgl 2798)mentioning

confidence: 99%

A search for clustering around Herbig Ae/Be stars

Testi

Palla

Natta

1998

Astron. Astrophys. Suppl. Ser.

173

270

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Abstract. We present large field infrared images of a sample of 45 Herbig Ae/Be stars. Stellar parameters, such as age and luminosity, have been derived for all of them in a consistent way. The images have been used to identify stellar groups or clusters associated with the Herbig Ae/Be star. The results presented in this paper form the database for a study of clustering around intermediate mass stars ).

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“…On the optical image there is a star-like condensation NO and several filamentary nebulae, the brightest of them named Nl. Cohen (1977) proposed that this object is connected with a young 07 star, at a distance of 6 kpc (3.5 kpc in Goodrich 1986), and with a mass of 10 M 0 . V645 Cyg is located at the center of a molecular cloud emitting in CO and NH3 molecular lines (bipolar outflow in CO: Schulz et al 1989;Torrelles et al 1987), and at the center of a 7" thermal continuum radio source (Skinner, Brown, & Stewart 1993).…”

Section: Introductionmentioning

confidence: 99%

A Protoplanetary Disk in V645 Cyg As Seen with H₂O and Methanol Masers

Вальтц¹,

Slysh²,

Voronkov³

et al. 2002

International Astronomical Union Colloquium

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Abstract. Radio images of maser spots in the infrared source RAFGL 2789, connected with the young stellar object V645 Cyg, have been obtained as a result of radio interferometric observations of the H2O maser at 22 GHz and the methanol maser at 6.7 GHz, with the VLBI arrays VLBA and EVN. It is shown that the position of the masers coincides with the optical object within $'.2. The maser spots are located along the line North-South, and their position and radial velocity can be described by a model of a Keplerian disk with a maximum radius of 40 AU for the H2O maser and 800 AU for the methanol maser. The H2O and methanol maser spots have not been resolved, and lower limits of the brightness temperature are 2 x 10 13 K and 1.4 x 10 9 K, respectively. A model of the maser is suggested in which the maser emission is generated in extended water and methanol envelopes of icy planets orbiting the young star.

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The nature of V645 Cygni = CRL 2789

Cited by 23 publications

References 0 publications

Evidence for variable outflows in the young stellar object V645 Cygni

Evidence for variable outflows in the young stellar object V645 Cygni

A search for clustering around Herbig Ae/Be stars

A Protoplanetary Disk in V645 Cyg As Seen with H₂O and Methanol Masers

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The nature of V645 Cygni = CRL 2789

Cited by 23 publications

References 0 publications

Evidence for variable outflows in the young stellar object V645 Cygni

Evidence for variable outflows in the young stellar object V645 Cygni

A search for clustering around Herbig Ae/Be stars

A Protoplanetary Disk in V645 Cyg As Seen with H2O and Methanol Masers

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A Protoplanetary Disk in V645 Cyg As Seen with H₂O and Methanol Masers