Searching for New Objects with the B[e] Phenomenon
Naurzbayeva A.Z. Alimgazinova N.S. Miroshnichenko A.S. Rossi C. Reva I.V. Kokumbayeva R.I. Omarov C.T. Zharikov S.V. Manset N. Raj A. Joshi A. Rudy R.J. Puetter R.C. Perry R.B. Turekhanova K.M.
June 2025Multidisciplinary Digital Publishing Institute (MDPI)
Galaxies
2025#13Issue 3
Objects with the B[e] phenomenon, whose defining features are the presence of forbidden emission lines and infrared excess coming from circumstellar dust, represent a broad range of evolutionary stages from pre-main-sequence to planetary nebulae. They are important for understanding mechanisms of the circumstellar matter formation and evolution. However, it is not easy to discover them, especially among faint stars, as forbidden emission lines are usually weak and hardly noticeable in low-resolution spectra. We developed photometric criteria to search for candidate objects with this phenomenon based on a combination of optical and near-infrared color indices and found nearly 40 objects that satisfy these criteria. Spectroscopy of the candidates allows us to make more confident conclusions on their classification. We present the results of our photometric and spectroscopic observations of six objects, which are part of a large list of ∼40 objects that satisfy our photometric selection criteria for candidate objects with the B[e] phenomenon. Forbidden lines of neutral oxygen were clearly detected in the optical spectrum of one object (VES 683) and suspected in three others. One object, AS 415, is most likely a binary system with components that exhibit partial eclipses but without the B[e] phenomenon, while IRAS 20402 + 4638 may be a luminous member of the FS CMa objects group.
circumstellar matter , emission-line stars , photometry , spectroscopy
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Faculty of Physics and Technology, Al-Farabi Kazakh National University, Al-Farabi Ave., 71, Almaty, 050040, Kazakhstan
Department of Physics and Astronomy, University of North Carolina, Greensboro, 27402, NC, United States
Fesenkov Astrophysical Institute, Observatory, 23, Almaty, 050020, Kazakhstan
Dipartimento di Fisica, Universitá Sapienza, Piazzale Aldo Moro 2, Roma, I 00185, Italy
Instituto de Astronomía, Universidad Nacional Autónoma de Mexico, AP 106, BC, Ensenada, 22800, Mexico
Canada-France-Hawaii Telescope Corporation, 65-1238 Mamalahoa Hwy, Kamuela, 96743, HI, United States
Indian Centre for Space Physics, 466 Barakhola, Netai Nagar, West Bengal, Kolkata, 700099, India
Uttar Pradesh State Institute of Forensic Science (UPSIFS), Aurawan, P.O. BanthraUP, Lucknow, 226401, India
Institute of Astrophysics, Pontificia Universidad Católica de Chile, Av. Vicuña MacKenna 4860, Santiago, 7820436, Chile
Kookoosint Scientific, 1530 Calle Portada, Camarillo, 93010, CA, United States
Center for Astrophysics, Space Science University of California, 9500 Gilman Dr La Jolla, San Diego, 92093, CA, United States
Alabaster Scientific, P.O. Box 120, Irvington, 22480, VA, United States
Faculty of Physics and Technology
Department of Physics and Astronomy
Fesenkov Astrophysical Institute
Dipartimento di Fisica
Instituto de Astronomía
Canada-France-Hawaii Telescope Corporation
Indian Centre for Space Physics
Uttar Pradesh State Institute of Forensic Science (UPSIFS)
Institute of Astrophysics
Kookoosint Scientific
Center for Astrophysics
Alabaster Scientific
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