Astronomy:Holoea
Holoea, designated IRAS 05327+3404, is a young stellar object in the constellation Auriga, in the direction of the star cluster Messier 36. It may not be part of M36, but may instead be part of the more distant star-forming region S235;[1] alternatively, it may represent ongoing star formation in M36.[2] Holoea is a rare transitional object between class I (protostars) and class II (pre-main-sequence stars). It is surrounded by large amounts of circumstellar material, including outflowing jets.[3]
The outflow was first observed in 1993 with the MDM Observatory at Kitt Peak, Arizona, with follow-up observations by the James Clerk Maxwell Telescope at Mauna Kea, Hawaii. The discovery was published in 1996 and given the name Holoea, Hawaiian for "flowing gas".[1] The name was officially approved by the IAU Working Group on Star Names on 18 April 2026.[4]
Images of Holoea show a nebulous "tail", while spectroscopic observations indicate the presence of bipolar jets. The spectra are unusual; they appear to represent two views of the jets from different angles, one the result of reflection off the "tail".[1] The star itself is seen directly, not via a reflection.[5] Holoea is similar to L1551 IRS 5, an FU Orionis star.[1] It has a large circumstellar disk[5] that extends from 24.5±0.15 au to 690±12 au.[2] A 2013 study found two sources of emission in submillimeter wavelengths: the source designated SMM 1 corresponds to Holoea, while SMM 2 is a second, nearby young stellar object which may be a binary companion of Holoea.[3]
The discovery of Holoea led to searches for other transitional young stellar objects.[6] A pair of such objects, called MB 4, has been found in the direction of Camelopardalis.[7]
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References
- ↑ 1.0 1.1 1.2 1.3 Magnier, E. A.; Waters, L. B. F. M. et al. (January 1996). "A bipolar-outflow object in the field of M 36.". Astronomy and Astrophysics 305: 936. ISSN 0004-6361. Bibcode: 1996A&A...305..936M.
- ↑ 2.0 2.1 Panja, Alik; Chen, Wen Ping et al. (March 2021). "Sustaining Star Formation in the Galactic Star Cluster M 36?". The Astrophysical Journal 910 (1): 80. doi:10.3847/1538-4357/abded4. ISSN 0004-637X. Bibcode: 2021ApJ...910...80P.
- ↑ 3.0 3.1 Morata, O.; Kuan, Y.-J. et al. (September 2013). "Millimetric and Submillimetric Observations of IRAS 05327+3404 "Holoea" in M36". The Astronomical Journal 146 (3): 49. doi:10.1088/0004-6256/146/3/49. ISSN 0004-6256. Bibcode: 2013AJ....146...49M.
- ↑ "IAU Catalog of Star Names". https://exopla.net/star-names/modern-iau-star-names/.
- ↑ 5.0 5.1 Magnier, E. A.; Waters, L. B. F. M. et al. (June 1999). "The circumstellar environment of IRAS 05327+3404". Astronomy and Astrophysics 346: 441-452. Bibcode: 1999A&A...346..441M.
- ↑ Magnier, E. A.; Volp, A. W. et al. (December 1999). "Transitional YSOs: candidates from flat-spectrum IRAS sources". Astronomy and Astrophysics 352: 228-238. Bibcode: 1999A&A...352..228M.
- ↑ McCall, Marshall L.; Buta, Ronald J. et al. (July 2004). "Discovery of a Huge Young Stellar Object Interaction Region in Camelopardalis" (in en). The Astronomical Journal 128 (1): 375–386. doi:10.1086/421370. ISSN 0004-6256. Bibcode: 2004AJ....128..375M.
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