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# Program information file
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PROGRAM_ID 2024A003
PROGRAM_TITLE Near infrared spectroscopy of the recurrent nova V745 Sco in quiescence with SpeX
PROGRAM_INV1 Chick Woodward
PROGRAM_INV2 Nye Evans
PROGRAM_INV3 Dipankar P.K. Banerjee
PROGRAM_INV4 Bogdan Kaminsky
PROGRAM_INV5 Tom Geballe
PROGRAM_SCICAT stellar
PROGRAM_ABSTRACT_BEG
We propose to obtain 0.8-2.5 micron infrared spectra with Spex in SXD mode of the recurrent nova V745 Sco. The science goals are to determine the properties of the red giant [RG] secondary, including elemental abundances, C and O isotopic ratios, and the extent of any hot circumstellar dust. Abundances and isotopic ratios in the RG photosphere may be affected by [i] processes in the red giant interior which are brought to the surface during dredge-up, [ii] contamination of the red giant, either during the common envelope phase of the binary evolution or by material synthesized in recurrent nova eruptions, or a combination of the two. The objective is to determine the extent to which recurrent nova eruptions pollute the photosphere of the secondary. If the contamination is long-term [i.e., comparable with the inter-outburst period], the implications for the composition of the material accreted on to the white dwarf [WD] will be substantial. Understanding this process will be important to constraining theoretical models for the evolution of nova systems. The RG component is irradiated by the hot WD; however, we can determine the degree of irradiation from the binary ephemeris.
PROGRAM_ABSTRACT_END