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The A2Π–X2Σ+ Band System of YO

Year: 2024
Type: article
Abstract: YO bands are conspicuous in the spectra of S stars. The laboratory spectrum of the A2Π–X2Σ+ electronic transition has been recorded with a Fourier transform spectrometer using a composite-wall hollow cathode lamp source. The A2Π–X2Σ+ transition with v ′ ≤ 4 and v″ ≤ 4 has been rotationally analyzed using the modern spectral fitting program PGOPHER. Vibronic band strengths were calculated using an ab initio transition dipole moment function. A line list for the A2Π–X2Σ+ transition is provided and can be utilized in the modeling of S stars.
DOI: 10.3847/1538-4357/ad6e79
Language: English
Open Access status: gold
Estimated APC paid: $4,499
Award: THE THEME OF THIS PROPOSAL IS THE LABORATORY SPECTROSCOPY OF MOLECULES OF IMPORTANCE IN COOL ASTRONOMICAL OBJECTS INCLUDING LOW MASS STARS EXTRASOLAR PLANETS BROWN DWARFS M-TYPE STARS CARBON STARS AND COMETS. OUR PRIMARY FOCUS WILL BE ON HOT H2O CH4 NH3 CAOH AND DIATOMIC HYDRIDES AND OXIDES. HYDROGEN PRESSURE-BROADENING PARAMETERS WILL BE MEASURED FOR WATER METHANE AND AMMONIA AT HIGH TEMPERATURE. THESE MOLECULES ARE KEY SPECIES FOR THE CLASSIFICATION OF THE SPECTRA OF COOL STELLAR AND SUB-STELLAR OBJECTS INCLUDING BROWN DWARFS AND EXOPLANETS. WE PLAN TO PROVIDE LINE POSITIONS LINE INTENSITIES AND LOWER STATE ENERGIES (PLUS H2-BROADENING COEFFICIENTS) BY COMBINING EXPERIMENTAL AND THEORETICAL DATA IN AN OPTIMAL WAY TO CREATE SPECTRAL LINE LISTS. THESE LINE LISTS ARE EASILY CONVERTED TO MOLECULAR OPACITIES THAT ARE USED TO COMPUTE SPECTRAL ENERGY DISTRIBUTIONS EMITTED BY COOL OBJECTS. THE EXPERIMENTAL PART OF THE RESEARCH WILL BE CARRIED OUT BY RECORDING FOURIER TRANSFORM SPECTRA USING A VARIETY OF MOLECULAR SOURCES. COOL OBJECTS SUCH AS BROWN DWARFS AND EXOPLANETS ARE PRIMARY TARGETS FOR A NUMBER OF NASA MISSIONS SUCH AS TESS KEPLER&K2 SOFIA AND JWST.
OpenAlex ID: W4403134702
FWCI: 0.191
Cites: 30
Cited by: 1
Related to: 10