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It has been argued that GCIRS 7 is a pulsating body, on the basis of photometric variability.<\/jats:p>\n<jats:p><jats:italic>Aims.<\/jats:italic> Our goal is to confirm photospheric pulsations based on interferometric size measurements to better understand how the mass loss from these massive stars enriches the local interstellar medium.<\/jats:p>\n<jats:p><jats:italic>Methods.<\/jats:italic> We present the first medium-resolution (<jats:italic>R<\/jats:italic> = 500), <jats:italic>K<\/jats:italic>-band spectro-interferometric observations of GCIRS 7, using the GRAVITY instrument with the four auxiliary telescopes of the ESO VLTI. We looked for variations using two epochs, namely 2017 and 2019.<\/jats:p>\n<jats:p><jats:italic>Results.<\/jats:italic> We find GCIRS 7 to be moderately resolved with a uniform-disk photospheric diameter of <jats:italic>\u03b8<\/jats:italic><jats:sub>UD<\/jats:sub><jats:sup>*<\/jats:sup>\u2009=\u20091.55\u2009\u00b1\u20090.03 mas (<jats:italic>R<\/jats:italic><jats:sub>UD<\/jats:sub><jats:sup>*<\/jats:sup>\u2009=\u20091368\u2009\u00b1\u200926 <jats:italic>R<\/jats:italic><jats:sub>\u2299<\/jats:sub>) in the <jats:italic>K<\/jats:italic>-band continuum. The narrow-band uniform-disk diameter increases above 2.3 \u03bcm, with a clear correlation with the CO band heads in the spectrum. This correlation is aptly modeled by a hot (<jats:italic>T<\/jats:italic><jats:sub>L<\/jats:sub> = 2368 \u00b1 37 K), geometrically thin molecular shell with a diameter of <jats:italic>\u03b8<\/jats:italic><jats:sub>L<\/jats:sub> = 1.74 \u00b1 0.03 mas, as measured in 2017. The shell diameter increased (<jats:italic>\u03b8<\/jats:italic><jats:sub>L<\/jats:sub> = 1.89 \u00b1 0.03 mas), while its temperature decreased (<jats:italic>T<\/jats:italic><jats:sub>L<\/jats:sub> = 2140 \u00b1 42 K) in 2019. In contrast, the photospheric diameter <jats:italic>\u03b8<\/jats:italic><jats:sub>UD<\/jats:sub><jats:sup>*<\/jats:sup> and the extinction up to the photosphere of GCIRS 7 (<jats:italic>A<\/jats:italic><jats:sub>K<jats:sub>S<\/jats:sub><\/jats:sub>\u2009=\u20093.18\u2009\u00b1\u20090.16) have the same value within uncertainties at the two epochs.<\/jats:p>\n<jats:p><jats:italic>Conclusions.<\/jats:italic> In the context of previous interferometric and photo-spectrometric measurements, the GRAVITY data allow for an interpretation in terms of photospheric pulsations. The photospheric diameter measured in 2017 and 2019 is significantly larger than previously reported using the PIONIER instrument (<jats:italic>\u03b8<\/jats:italic><jats:sub>*<\/jats:sub> = 1.076 \u00b1 0.093 mas in 2013 in the <jats:italic>H<\/jats:italic> band). The parameters of the photosphere and molecular shell of GCIRS 7 are comparable to those of other red supergiants that have previously been studied using interferometry. The extinction we measured here is lower than previous estimates in the direction of GCIRS 7 but typical for the central parsec region.<\/jats:p>","DOI":"10.1051\/0004-6361\/202039501","type":"journal-article","created":{"date-parts":[[2021,5,19]],"date-time":"2021-05-19T08:06:37Z","timestamp":1621411597000},"page":"A37","source":"Crossref","is-referenced-by-count":3,"title":["MOLsphere and pulsations of the Galactic Center\u2019s red supergiant GCIRS 7 from VLTI\/GRAVITY"],"prefix":"10.1051","volume":"651","author":[{"name":"GRAVITY Collaboration","sequence":"first","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4177-6433","authenticated-orcid":false,"given":"G.","family":"Rodr\u00edguez-Coira","sequence":"additional","affiliation":[]},{"given":"T.","family":"Paumard","sequence":"additional","affiliation":[]},{"given":"G.","family":"Perrin","sequence":"additional","affiliation":[]},{"given":"F.","family":"Vincent","sequence":"additional","affiliation":[]},{"given":"R.","family":"Abuter","sequence":"additional","affiliation":[]},{"given":"A.","family":"Amorim","sequence":"additional","affiliation":[]},{"given":"M.","family":"Baub\u00f6ck","sequence":"additional","affiliation":[]},{"given":"J. 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