Herbig Ae/Be stars towards the dark cloud LDN 1667
C. B. Pereira (1), L. F. Miranda (2), W. L. F. Marcolino (3) ((1), Observat\'orio Nacional/MCTIC, Brazil, (2) Instituto de Astrof\'isica de, Andaluc\'ia--CSIC, Spain, (3) Universidade Federal do Rio de Janeiro, Brazil)

TL;DR
This study reports the discovery and characterization of a new Herbig Ae/Be star, SPH4-South, in the dark cloud LDN 1667, using spectroscopy, photometry, and color analysis, and discusses its possible membership in the cloud.
Contribution
It introduces the identification of SPH4-South as a Herbig Ae/Be star and applies multi-wavelength analysis to determine its properties and potential association with LDN 1667.
Findings
SPH4-South is classified as a Herbig Ae/Be star.
SPH4 is confirmed as a member of LDN 1667.
SPH4-South is likely associated with the nebula and possibly with LDN 1667.
Abstract
We report the discovery of a new emission-line object, named SPH4-South = (GAIA EDR3 5616553300192230272), towards the dark cloud LDN 1667. This object came to our attention after inspecting public images that show a faint diffuse nebula a few arcsec southern from SPH4, an emission-line object previously classified as a T Tauri star. We present high-resolution spectra and analyzed JHK photometry of SPH4 and SPH4-South, and new narrow-band and archival broad-band images of these objects. A comparison of the spectra of SPH4 and SPH4-South with high-resolution ones of DG Cir and R Mon, strongly suggests that SPH 4 and SPH4-South are Herbig Ae/Be stars. The classification of SPH4-South is further supported by using a k-NN algorithm to its position in 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 SPH4 as a Class I…
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Taxonomy
TopicsAstrophysics and Star Formation Studies · Stellar, planetary, and galactic studies · Astro and Planetary Science
