3 Camelopardalis

| r-i = | v-r = | b-v = 1.07 | u-b = 0.89

3 Camelopardalis is a spectroscopic and visual binary in the constellation Camelopardalis. It is approximately 496 light years from Earth.

3 Camelopardalis is a visual binary with the two components separated by 3.7". The brighter of the pair is also a single-lined spectroscopic binary with an orbital period of 121 days.

The primary component, 3 Camelopardalis Aa, is an orange K-type giant with a mean apparent magnitude of +5.07. It rotates once every 121 days, matching the orbital period with its close companion. It was thought to be a short period Cepheid variable when it was first investigated, but has since been classified as a probable RS Canum Venaticorum variable. The total amplitude of its variations is less than 0.1 magnitudes.

The spectroscopic companion has not been observed directly and its cannot be detected in the spectrum. It is inferred on the basis of radial velocity variations in its brighter companion. Assuming a circular orbit, it has a mass of .

The visual companion is a 12th magnitude star.

References

| doi-access=free | s2cid=15290475

References

1. "MAST: Barbara A. Mikulski Archive for Space Telescopes". Space Telescope Science Institute.
2. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics.
3. (2008). "A catalogue of chromospherically active binary stars (third edition)". Monthly Notices of the Royal Astronomical Society.
4. (2007). "The rotation-activity correlation among G and K giants in binary systems". Astronomy & Astrophysics.
5. (2008). "Comparative statistics and origin of triple and quadruple stars". Monthly Notices of the Royal Astronomical Society.
6. (2016). "The PASTEL catalogue: 2016 version". Astronomy & Astrophysics.
7. (2004). "SB9: The ninth catalogue of spectroscopic binary orbits". Astronomy & Astrophysics.
8. (1995). "VizieR Online Data Catalog: Bright Star Catalogue, 5th Revised Ed. (Hoffleit+, 1991)". VizieR On-line Data Catalog: V/50. Originally Published in: 1964BS....C......0H.
9. (2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics.
10. MacRae, D. A.. (1975). "David Dunlap Observatory, University of Toronto, Richmond Hill, Ontario, Canada. Observatory report". Bulletin of the American Astronomical Society.
11. [http://webviz.u-strasbg.fr/viz-bin/VizieR-S?NSV%201681 NSV 1681]