Molecules in the peculiar age-defying source IRAS 19312+1950
arXiv:2211.13640 · doi:10.1051/0004-6361/202244559
Abstract
Context. IRAS 19312+1950 is an isolated infrared source that exhibits a characteristic quasi-point-symmetric morphology in the near- and mid-infrared images and is also very bright in molecular radio lines. Because of its unique observational characteristics, various observational studies have been conducted and several hypotheses have been proposed regarding its origin, which is still unclear. So far, it has been suggested that it could be a peculiar evolved star, a young stellar object, or even a red nova remnant. Regardless of which type of object it is ultimately classified as, IRAS 19312+1950 is exceptionally bright in the infrared and molecular radio lines and therefore will undoubtedly be crucial as a prototype of this kind of object having a peculiar nature or unusual evolutionary phase. Aims. This study aims to reveal the molecular composition of the central part of IRAS 19312+1950 by performing an unbiased molecular radio line survey and discussing the origin of the object from a molecular chemical point of view. Methods. We carried out a spectral line survey with the IRAM 30 m telescope towards the center of IRAS 19312+1950 in the 3 and 1.3 mm windows. Results. In total, 28 transition lines of 22 molecular species and those isotopologues are detected towards IRAS 19312+1950, some of which exhibit a broad and a narrow components. Seventeen thermal lines and 1 maser line are newly detected. The molecular species of CO, SiO, HNC, HCO, HCO, and -CH are detected for the first time in this object. Conclusions. Our results, in combination with previous studies, favor the hypothesis that IRAS 19312+1950 might be a red nova remnant, in which the progenitors that merged to become a red nova may have contained at least two evolved stars with oxygen-rich and carbon-rich chemistry, respectively.
arXiv comment30 pages, 24 figures, accepted for publication in A&A
References in corpus (59)
- Gaia Data Release 2. Summary of the contents and survey properties
- Common Envelope Evolution: Where we stand and how we can move forward
- Interpreting Spectral Energy Distributions from Young Stellar Objects. I. A grid of 200,000 YSO model SEDs
- Nucleosynthesis in Classical Novae: ONe vs. CO White Dwarfs
- 2021 Census of Interstellar, Circumstellar, Extragalactic, Protoplanetary Disk, and Exoplanetary Molecules
- 2018 Census of Interstellar, Circumstellar, Extragalactic, Protoplanetary Disk, and Exoplanetary Molecules
- Dynamic star formation in the massive DR21 filament
- ATLASGAL --- properties of a complete sample of Galactic clumps
- A study of high velocity molecular outflows with an up-to-date sample
- Astrochemistry During the Formation of Stars
- The Gould's Belt Distances Survey (GOBELINS) II. Distances and structure towards the Orion Molecular Clouds
- New Protostellar Collapse Candidates: An HCO+ Survey of the Class 0 Sources
- Shape: A 3D Modeling Tool for Astrophysics
- `Thermal' SiO radio line emission towards M-type AGB stars: a probe of circumstellar dust formation and dynamics
- Eruptions of the V838 Mon type: stellar merger versus nuclear outburst models
- Molecular abundances in the inner layers of IRC +10216
- The Bolocam Galactic Plane Survey. VII. Characterizing the Properties of Massive Star-Forming Regions
- Revealing the physical properties of molecular gas in Orion with a large scale survey in J=2-1 lines of 12CO, 13CO and C18O
- Embedded Protostars in the Dust, Ice, and Gas In Time (DIGIT) Key Program: Continuum SEDs, and an Inventory of Characteristic Far-Infrared Lines from PACS Spectroscopy
- ALMA Observations of Infalling Flows toward the Keplerian Disk around the Class I Protostar L1489 IRS
- The HNC/HCN Ratio in Star-Forming Regions
- HCN/HNC intensity ratio: a new chemical thermometer for the molecular ISM
- Lambda = 3 mm line survey of nearby active galaxies
- ATLASGAL-selected massive clumps in the inner Galaxy, II: Characterisation of different evolutionary stages and their SiO emission
- The RMS Survey: Near-IR Spectroscopy of Massive Young Stellar Objects
- The millimeter IRAM-30m line survey toward IK Tau
- Nova nucleosynthesis and Galactic evolution of the CNO isotopes
- Submillimeter-wave emission of three Galactic red novae: cool molecular outflows produced by stellar mergers
- SiO in C-rich circumstellar envelopes of AGB stars: effects of non-LTE chemistry and grain adsorption
- Disk Masses for Embedded Class I Protostars in the Taurus Molecular Cloud
- Spatially Extended Brackett Gamma Emission in the Environments of Young Stars
- Nuclear ashes and outflow in the eruptive star Nova Vul 1670
- SiO Maser Survey of Cold IRAS Sources
- Structure and dynamics of the class I young stellar object L1489 IRS
- ATLASGAL-selected massive clumps in the inner Galaxy: VI. Kinetic temperature and spatial density measured with formaldehyde
- Detection of SiO Maser Emission in V838 Mon
- A wind-shell interaction model for multipolar planetary nebulae
- Circumstellar molecular composition of the oxygen-rich AGB star IK Tau: I. Observations and LTE chemical abundance analysis
- Correlation between Infrared Colors and Intensity Ratios of SiO Maser Lines
- Organic molecules, ions, and rare isotopologues in the remnant of the stellar-merger candidate, CK Vulpeculae (Nova 1670)
- Detections of SiO and HO Masers in the Bipolar Nebula IRAS 19312+1950
- Water Maser Survey on AKARI and IRAS Sources: A Search for "Low-Velocity" Water Fountains
- Shaping the envelope of the asymptotic giant branch star W43A with a collimated fast jet
- Molecular remnant of Nova 1670 (CK Vulpeculae): I. Properties and enigmatic origin of the gas
- Exploring HNC and HCN line emission as probes of the protoplanetary disk temperature
- Maser Properties of the Enigmatic IRAS Source 19312+1950
- Study of the Bipolar Nebula IRAS 19312+1950. I. Mapping Observations
- A 3mm chemical exploration of small organics in Class I YSOs
- SiO maser astrometry of the red transient V838 Monocerotis
- Study of the Bipolar Nebula IRAS 19312+1950. II. Circumstellar Chemistry
- BIMA Array Observations of the Highly Unusual SiO Maser Source with a Bipolar Nebulosity, IRAS 19312+1950
- In search of infall motion in molecular clumps III: HCO+ (1-0) and H13CO+ (1-0) mapping observations toward the confirmed infall sources
- Detection of Bipolar Flow toward an Unusual SiO Maser Source IRAS 19312+1950
- On the nature of the enigmatic object IRAS 19312+1950: A rare phase of massive star formation?
- Methanol Observation of IRAS 19312+1950: A Possible New Type of Class I Methanol Masers
- The Contribution of Chemical Abundances in Nova Ejecta to the Interstellar Medium
- Wide Field CO Mapping in the Region of IRAS 19312+1950
- The GBT 67 -- 93.6 GHz Spectral Line Survey of Orion-KL
- The Owl and other strigiform nebulae: multipolar cavities within a filled shell