Herbig Ae/Be Stars toward the Dark Cloud LDN 1667

DOI: 
10.3847/1538-3881/abfe65
Publication date: 
24/08/2021
Main author: 
Pereira, C. B.
IAA authors: 
Miranda, L. F.
Authors: 
Pereira, C. B.;Miranda, L. F.;Marcolino, W. L. F.
Journal: 
The Astronomical Journal
Publication type: 
Article
Volume: 
162
Pages: 
71
Abstract: 
We report the discovery of a new emission-line object, named SPH 4-South = (GAIA EDR3 5616553300192230272), toward the dark cloud LDN 1667. This object came to our attention after inspecting public images that show a faint diffuse nebula a few arcseconds south of SPH 4, an emission-line object previously classified as a T Tauri star. We present high-resolution spectra and analyzed JHK photometry of SPH 4 and SPH 4-South and new narrowband and archival broadband images of these objects. A comparison of the spectra of SPH 4 and SPH 4-South with high-resolution ones of DG Cir and R Mon strongly suggests that SPH 4 and SPH 4-South are Herbig Ae/Be stars. The classification of SPH 4-South is further supported by using a k-NN algorithm to its position in an H-K versus J-H color-color diagram. Both stars are detected in the four WISE bands and the WISE colors allow us to classify SPH 4 as a Class I and SPH 4-South as a Class II source. We also show that the faint nebula is most probably associated with SPH 4-South. Using published results on LDN 1667 and the Gaia Early Data Release 3, we conclude that SPH 4 is a member of LDN 1667. The case of SPH 4-South is not clear because the determination of its distance and proper motion could be affected by the nebulosity around the star, although membership of SPH 4-South to LDN 1667 cannot be ruled out. <SUP>*</SUP> Based on the observations made with the 2.2 m telescope at the European Southern Observatory (La Silla, Chile) under the agreement between Observatório Nacional (Brazil) and European Southern Observatory (ESO) and also under the agreement between Observatório Nacional (Brazil) and Max Planck Institut für Astronomie (MPG) and also based on observations at Centro Astronómico Hispano Alemán (CAHA) at Calar Alto operated jointly by Instituto de Astrofísica de Andalucía (CSIC) and Max Planck Institut für Astronomie (MPG). Centro Astronómico Hispano en Andalucía is now operated by Instituto de Astrofísica de Andalucía and Junta de Andalucía.
Database: 
ADS
URL: 
https://ui.adsabs.harvard.edu/#abs/2021AJ....162...71P/abstract
ADS Bibcode: 
2021AJ....162...71P
Keywords: 
Stellar evolution;Early stellar evolution;1599;434