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140 results on '"Saar, A."'

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2. X-Ray, UV, and Optical Observations of Proxima Centauri’s Stellar Cycle

3. A Hale-like Cycle in the Solar Twin 18 Scorpii

4. X-Ray Activity Variations and Coronal Abundances of the Star–Planet Interaction Candidate HD 179949

5. Stellar Cycles in Fully Convective Stars and a New Interpretation of Dynamo Evolution

6. A Hale-like Cycle in the Solar Twin 18 Scorpii

10. Magnetic and Rotational Evolution of ρ CrB from Asteroseismology with TESS

11. Estimating Magnetic Filling Factors from Simultaneous Spectroscopy and Photometry: Disentangling Spots, Plage, and Network

12. When Do Stalled Stars Resume Spinning Down? Advancing Gyrochronology with Ruprecht 147

15. Rotation of Solar Analogs Crossmatching Kepler and Gaia DR2

16. Testing the Spectroscopic Extraction of Suppression of Convective Blueshift

19. Rotation of Solar Analogs Crossmatching Kepler and Gaia DR2

21. HARPS-N Solar RVs Are Dominated by Large, Bright Magnetic Regions

22. Turbulent Diffusion Derived from the Motions of SDO/AIA Coronal Bright Points

24. ATMOSPHERIC IMAGING ASSEMBLY MULTITHERMAL LOOP ANALYSIS: FIRST RESULTS

25. Stellar Surface Magneto-convection as a Source of Astrophysical Noise. II. Center-to-limb Parameterization of Absorption Line Profiles and Comparison to Observations

26. MULTI-STRANDED AND MULTI-THERMAL SOLAR CORONAL LOOPS: EVIDENCE FROMHINODEX-RAY TELESCOPE AND EUV IMAGING SPECTROMETER DATA

27. INTERACTIONS OF THE MAGNETOSPHERES OF STARS AND CLOSE-IN GIANT PLANETS

28. SOME LIKE IT HOT: CORONAL HEATING OBSERVATIONS FROMHINODEX-RAY TELESCOPE ANDRHESSI

29. RELIABILITY OF THE DETECTION OF THE BARYON ACOUSTIC PEAK

30. Toward Understanding Rich Superclusters

31. The Outer Solar Atmosphere during the Maunder Minimum: A Stellar Perspective

32. Testing the Reality of Strong Magnetic Fields on T Tauri Stars: The Naked T Tauri Star Hubble 4

33. A Comparison of the Outer Atmosphere of the 'Flat Activity' Star τ Ceti (G8 V) with the Sun (G2 V) and α Centauri A (G2 V)

34. On Stellar Activity Enhancement Due to Interactions with Extrasolar Giant Planets

35. Time Evolution of the Magnetic Activity Cycle Period. II. Results for an Expanded Stellar Sample

36. Two‐Component Theoretical Chromosphere Models for K Dwarfs of Different Magnetic Activity: Exploring the Ca<scp>ii</scp>Emission–Stellar Rotation Relationship

37. Parent Stars of Extrasolar Planets. IV. 14 Herculis, HD 187123, and HD 210277

39. Measurements of Starspot Parameters on Active Stars using Molecular Bands in Echelle Spectra

40. Magnetic Activity–related Radial Velocity Variations in Cool Stars: First Results from the Lick Extrasolar Planet Survey

41. Time Evolution of the Magnetic Activity Cycle Period

42. Activity‐Related Radial Velocity Variation in Cool Stars

43. The Emergence of Magnetic Flux Loops in Sunlike Stars

44. Properties of Sun‐like Stars with Planets: 51 Pegasi, 47 Ursae Majoris, 70 Virginis, and HD 114762

45. GIANT CORONAL LOOPS DOMINATE THE QUIESCENT X-RAY EMISSION IN RAPIDLY ROTATING M STARS

47. LINKING STELLAR CORONAL ACTIVITY AND ROTATION AT 500 MYR: A DEEPCHANDRAOBSERVATION OF M37

48. INTERNETWORK CHROMOSPHERIC BRIGHT GRAINS OBSERVED WITH IRIS AND SST

49. HOMOLOGOUS HELICAL JETS: OBSERVATIONS BYIRIS,SDO, ANDHINODEAND MAGNETIC MODELING WITH DATA-DRIVEN SIMULATIONS

50. ULTRA-LUMINOUS X-RAY SOURCES IN HARO 11 AND THE ROLE OF X-RAY BINARIES IN FEEDBACK IN LyαEMITTING GALAXIES

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