[SVF2019] NGC 4736-1 , the SIMBAD biblio

2019MNRAS.484L..24S - Mon. Not. R. Astron. Soc., 484, L24-L28 (2019/March-3)

New luminous blue variable candidates in NGC 4736.

SOLOVYEVA Y., VINOKUROV A., FABRIKA S., KOSTENKOV A., SHOLUKHOVA O., SARKISYAN A., VALEEV A., ATAPIN K., SPIRIDONOVA O., MOSKVITIN A. and NIKOLAEVA E.

Abstract (from CDS):

We have found three new luminous blue variable (LBV) candidates in the star-forming galaxy NGC 4736. They show typical well-known LBV spectra, broad and strong hydrogen lines, He I lines, many Fe II lines, and forbidden [Fe II] and [Fe III]. Using archival Hubble Space Telescope and ground-based telescope data, we have estimated the bolometric magnitudes of these objects from -8.4 to -11.5, temperatures, and reddening. Source NGC 4736_1 (Mv = -10.2 ± 0.1 mag) demonstrated variability between 2005 and 2018 as ΔV ≃ 1.1 mag and ΔB ≃ 0.82 mag; the object belongs to LBV stars. NGC 4736_2 (Mv < -8.6 mag) shows P Cyg profiles and its spectrum has changed from 2015 to 2018. The brightness variability of NGC 4736_2 is ΔV ≃ 0.5 mag and ΔB ≃ 0.4 mag. In NGC 4736_3 (Mv = -8.2 ± 0.2 mag), we found strong nebular lines, broad wings of hydrogen; the brightness variation is only ≃0.2 mag. Therefore, the last two objects may reside to LBV candidates.

Abstract Copyright: © 2019 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): stars: emission-line, Be - stars: massive - galaxies: individual: NGC 4736

Nomenclature: Table 1, Text: [SVF2019] NGC 4736-N (Nos 1-3).

Simbad objects: 7

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2020.12.01-00:47:09

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