2018A&A...617A..31A


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.10CEST01:12:01

2018A&A...617A..31A - Astronomy and Astrophysics, volume 617A, 31-31 (2018/9-1)

Revisiting the case of R Monocerotis: Is CO removed at R < 20 au?

ALONSO-ALBI T., RIVIERE-MARICHALAR P., FUENTE A., PACHECO-VAZQUEZ S., MONTESINOS B., BACHILLER R. and TREVINO-MORALES S.P.

Abstract (from CDS):


Context. To our knowledge, R Mon is the only B0 star in which a gaseous Keplerian disk has been detected. However, there is some controversy about the spectral type of R Mon. Some authors propose that it could be a later B8e star, where disks are more common.
Aims. Our goal is to re-evaluate the R Mon spectral type and characterize its protoplanetary disk.
Methods. The spectral type of R Mon has been re-evaluated using the available continuum data and UVES emission lines. We used a power-law disk model to fit previous 12CO 1-0 and 2-1 interferometric observations and the PACS CO data to investigate the disk structure. Interferometric detections of 13CO J=1-0, HCO+ 1-0, and CN 1-0 lines using the IRAM Plateau de Bure Interferometer (PdBI) are presented. The HCN 1-0 line was not detected.
Results. Our analysis confirms that R Mon is a B0 star. The disk model compatible with the 12CO 1-0 and 2-1 interferometric observations falls short of predicting the observed fluxes of the 14<Ju<31 PACS lines; this is consistent with the scenario in which some contribution to these lines is coming from a warm envelope and/or UV-illuminated outflow walls. More interestingly, the upper limits to the fluxes of the Ju>31 CO lines suggest the existence of a region empty of CO at R≥20au in the protoplanetary disk. The intense emission of the HCO+ and CN lines shows the strong influence of UV photons on gas chemistry.
Conclusions. The observations gathered in this paper are consistent with the presence of a transition disk with a cavity of Rin≥20au around R Mon. This size is similar to the photoevaporation radius that supports the interpretation that UV photoevaporation is main disk dispersal mechanism in massive stars

Abstract Copyright: © ESO 2018

Journal keyword(s): circumstellar matter - stars: emission-line, Be - stars: formation

VizieR on-line data: <Available at CDS (J/A+A/617/A31): list.dat fits/*>

Simbad objects: 10

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Number of rows : 10

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 NAME Orion Bright Bar reg 05 35 22.30 -05 24 33.0           ~ 716 0
2 HH 39 HH 06 39 07 +08 51.9           ~ 54 0
3 V* R Mon Ae* 06 39 09.9538710861 +08 44 09.559404231 10.76 12.46 11.85 10.96 10.25 B8IIIe 501 0
4 V* TW Hya TT* 11 01 51.9054298616 -34 42 17.031550898   11.94 10.50 10.626 9.18 K6Ve 1532 1
5 HD 97048 Ae* 11 08 03.3105687971 -77 39 17.491180130 9.03 8.76 9.00   8.64 A0Vep 458 0
6 HD 100546 Be* 11 33 25.4404858122 -70 11 41.239343121   6.71 6.30   6.64 A0VaekB8_lB 651 1
7 V* V866 Sco Or* 16 11 31.345632 -18 38 25.96200   13.98 12.63 12.81   K0e+K5e 244 0
8 IRAS 16245-2423 TT* 16 27 37.1911764648 -24 30 35.031583716       16.66 14.67 B5-F2 235 0
9 HD 163296 Ae* 17 56 21.2882188601 -21 57 21.872343282 7.00 6.93 6.85 6.86 6.67 A1Vep 802 0
10 V* S CrA Or* 19 01 08.597088 -36 57 19.89504   11.76 10.91 11.41   G0Ve+K0Ve 258 0

    Equat.    Gal    SGal    Ecl

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2020.07.10-01:12:01

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