000007668 001__ 7668
000007668 005__ 20251227102445.0
000007668 037__ $$aSCART-2025-0159
000007668 100__ $$aGroeneegen, m.a.t.
000007668 245__ $$aThe spectral energy distributions of very long-period cepheids in the Milky Way, the Magellanic Clouds, M31, and M33
000007668 260__ $$c2025
000007668 520__ $$aThe spectral energy distributions (SEDs) of 20 Milky Way (MW), 9 Large Magellanic Cloud (LMC), 7 Small Magellanic Cloud (SMC), 12 M31, and 7 M33 (classical) Cepheids with periods longer than 50 days were constructed using photometric data from the literature and fitted with model atmospheres with the aim of identifying objects with an infrared excess. The SEDs were fitted with stellar photosphere models to derive the best-fitting luminosity and effective temperature; a dust component was added when required. The distance and reddening values were taken from the literature. WISE and IRC images were inspected to verify whether potential excess emission was related to the central objects. Only one star with a significant infrared (IR) excess was found in the LMC and none in the SMC, M31, and M33, contrary to earlier work on the MW suggesting that IR excess may be more prominent in MW Cepheids than in the Magellanic Clouds. One additional object in the MW was found to have an IR excess, but it is unclear whether it is a classical Cepheid or a type-II Cepheid. The stars were plotted in a Hertzsprung–Russell diagram (HRD) and compared to evolutionary tracks for CCs and to theoretical instability strips. For the large majority of stars, the position in the HRD is consistent with the instability strip. For stars in the MW uncertainties in the distance and reddening can significantly change their position in the HRD.
000007668 594__ $$aNO
000007668 6531_ $$astars: distances
000007668 6531_ $$astars: fundamental parameters
000007668 6531_ $$astars: variables: Cepheids
000007668 773__ $$cA102$$pA&A$$v699$$y2025
000007668 8560_ $$fmartin.groenewegen@ksb-orb.be
000007668 8564_ $$s957316$$uhttp://publi2-as.oma.be/record/7668/files/Groenewegen_25AA699_A102_SED_LongPeriod_Cepheids_MW_MCs_M31_M33.pdf
000007668 8564_ $$s3329$$uhttp://publi2-as.oma.be/record/7668/files/Groenewegen_25AA699_A102_SED_LongPeriod_Cepheids_MW_MCs_M31_M33.gif?subformat=icon$$xicon
000007668 8564_ $$s7962$$uhttp://publi2-as.oma.be/record/7668/files/Groenewegen_25AA699_A102_SED_LongPeriod_Cepheids_MW_MCs_M31_M33.jpg?subformat=icon-180$$xicon-180
000007668 905__ $$apublished in
000007668 980__ $$aREFERD