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Related Experiment Videos

Identification of SH Deltav=1 Ro-vibrational Lines in R Andromedae.

Yamamura, Kawaguchi, Ridgway

    The Astrophysical Journal
    |December 10, 1999
    PubMed
    Summary

    Sulfur hydride (SH) molecules were detected for the first time in the S-type star R Andromedae, revealing inward motion in its stellar atmosphere. This discovery offers new insights into the dynamics of cool stars.

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    Total Synthesis of Bryostatin 3 This work was supported by the Ministry of Education, Science, Sports, and Culture (Japan). K.O. is grateful to JSPS for a predoctoral fellowship. The authors thank Dr. G. N. Chmurny (NIH) for providing them with (1)H and (13)C NMR spectra of bryostatin 3 and for helpful discussions.

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    Measurement and Network Modeling of Liquid Permeation into Compacted Mineral Blocks.

    Journal of colloid and interface science·2000

    Area of Science:

    • Astronomy
    • Astrophysics
    • Molecular Spectroscopy

    Background:

    • S-type stars like R Andromedae exhibit complex atmospheric dynamics.
    • Understanding molecular species in stellar atmospheres is crucial for stellar evolution models.

    Purpose of the Study:

    • To report the first astronomical detection of the sulfur hydride (SH) molecule.
    • To investigate the physical conditions and dynamics of the molecular layer in R Andromedae.

    Main Methods:

    • Analysis of high-resolution infrared spectrum of R Andromedae.
    • Identification of SH Deltav=1 ro-vibrational lines.
    • Application of a spherical shell model to determine atmospheric conditions.

    Main Results:

    • First astronomical detection of SH molecule confirmed.
    • Inverse P Cygni profiles indicate infall motion (9 km s-1) in a layer from 1.0 to 1.1 stellar radii.
    • An excitation temperature of 2200 K and SH/H abundance of 1x10-7 were determined.

    Conclusions:

    • The detected SH molecule provides evidence of infall motion driven by stellar pulsation in R Andromedae.
    • Results are consistent with previous observations of CO Deltav=3 transitions.
    • The findings support thermal equilibrium calculations for molecular abundance.

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