000007799 001__ 7799
000007799 005__ 20260113123322.0
000007799 037__ $$aSCART-2026-0052
000007799 100__ $$aTrust, Otto
000007799 245__ $$aHigh-precision Photometry and HERMES Spectroscopy of Four Bright Stars Near M44
000007799 260__ $$c2026
000007799 520__ $$aWe present the first homogeneous photometric and spectroscopic study of four bright field stars (HD 73135, BD +19◦ 2045, BD +19◦ 2046, and TYC 1395-855-1) that lie close to the variable HD 73045. These were monitored, but never fully analysed, by the Nainital–Cape Survey. Johnson-BV CCD time series from four 0.4–1.3 m telescopes show all four stars to be constant at the ≲ 0.12 mag level. Space-based K2 Campaigns 5 and 18 reveal low-amplitude variability only in HD 73135 and BD +19◦ 2045, and we additionally analyse TESS photometry from Sectors 45 and/or 72. HD 73135 shows a persistent 1.4–1.6 d doublet consistent with rotational modulation, although an orbital (ellipsoidal) interpretation cannot be excluded without time-series radial velocities; in TESS the dominant low-frequency power shifts to longer timescales (P ≃ 3–4.5 d), inconsistent with the vsini-R constraint, and we therefore adopt the K2 timescale. BD +19◦ 2045 exhibits a 0.08–0.40 d−1 γ-Doradus g-mode spectrum also detected in TESS Sector 72. BD +19◦ 2046 and TYC 1395-855-1 are non-variable or only marginally variable in K2 but show coherent low-frequency signals in TESS, which we conservatively classify as uncertain. In addition, high-resolution HERMES spectra confirm HD 73135’s Am nature (kA7 hF1 mF2) and show Sr–Ba overabundances of ∼ +1 dex. BD +19◦ 2045 is a chemically normal F8 V star, while BD +19◦ 2046 and TYC 1395-855-1 are K1–K2 sub-giants. Using spectroscopic constraints, we performed the first-step towards precise characterisation of these stars, yielding the masses, radii, and ages. These stars are located just 6◦ from the planned PLATO North-Ecliptic Ridge field, hence furnish benchmark targets for forthcoming asteroseismic and exoplanet surveys.
000007799 594__ $$aNO
000007799 6531_ $$aStars: chemically peculiar
000007799 6531_ $$aStars: rotation
000007799 6531_ $$aStars: starspots
000007799 6531_ $$aStars: general
000007799 700__ $$aJoshi, Santosh
000007799 700__ $$aNsamba, Benard
000007799 700__ $$aAol, Sharon
000007799 700__ $$aVermeulen, Owen
000007799 700__ $$aSsembatya, Ronald
000007799 700__ $$aDe Cat, Peter
000007799 700__ $$aLampens, Patricia
000007799 700__ $$aBarnes, Sydney A.
000007799 700__ $$aGoswami, Partha P.
000007799 700__ $$aDileep, Athul
000007799 700__ $$aGhosh, Surath C.
000007799 700__ $$aKumar,  Pramod S.
000007799 700__ $$aJurua, Edward
000007799 700__ $$aSarkar, Mrinmoy
000007799 700__ $$aBedi, Sarabjeet S.
000007799 773__ $$pMonthly Notices of the Royal Astronomical Society$$y2026
000007799 8560_ $$fpeter.decat@ksb-orb.be
000007799 905__ $$asubmitted to
000007799 980__ $$aREFERD