3 Serpentis

{{Starbox begin

| name = 3 Serpentis

}}

{{Starbox image

| image=

{{Location mark

|image=Serpens constellation map.svg|alt=|float=center|width=280

|label=|position=right

|mark=Red circle.svg|mark_width=10|mark_link=3 Serpentis

|x=970|y=388

}}

|caption=Location of 3 Serpentis (circled)

}}

{{Starbox observe

| epoch = J2000

| constell = Serpens

| ra = {{RA|15|15|11.3569}}

| dec = {{DEC|+04|56|21.680}}

| appmag_v = 5.337

}}

{{Starbox character

| class = K0III

| r-i =

| v-r =

| b-v =

| u-b =

| variable =

}}

{{Starbox astrometry

| radial_v =

| prop_mo_ra = {{val|−17.768|0.264}}

| prop_mo_dec = {{val|4.496|0.225}}

| parallax = 6.3077

| p_error = 0.2396

| parallax_footnote =

| absmag_v = +1.15

}}

{{Starbox orbit

| reference =

| period = {{val|66|5}}

| axis = {{val|229|2}}

| inclination = {{val|132|4}}

| eccentricity = {{val|0.962|0.005}}

}}

{{Starbox detail

| mass =

| radius =

| luminosity =

| temperature = 4,550

| metal_fe = +0.03

| gravity = +2.77

| rotational_velocity = 1.5

| age_gyr =

}}

{{Starbox catalog

| names = {{ odlist | F=3 Ser | BD=+05°2985 | FK5=562 | HD=135482 | HIP=74649 | HR=5675 | SAO=120916 }}

}}

{{Starbox reference

| Simbad = HD+135482

}}

3 Serpentis is a binary star in the constellation Serpens with an orbital period of approximately 66 years. It is dimly visible to the naked eye with an apparent magnitude of 5.337. Located around {{convert|114|pc|ly}} distant, it is an orange giant of spectral type K0III, a star that has used up its core hydrogen.

The two components of 3 Serpentis can be resolved using speckle interferometry and were separated by 0.23" in 2014. The orbit is highly eccentric and at periastron passage in 1997, the two are calculated to have been only 6 mas apart.

Individual spectra for the two components of 3 Serpentis cannot be obtained and the spectral type of K0III is for the two stars combined. The primary is 2.5 magnitudes brighter than the secondary and cooler. The combined spectral type indicates that the primary is likely to have evolved away from the main sequence, but comparison of the colour and brightness of the secondary suggest it is still a main sequence star.

References

{{reflist|refs=

{{cite journal|bibcode=2016A&A...591A.118S|title=The PASTEL catalogue: 2016 version|journal=Astronomy & Astrophysics|volume=591|pages=A118|arxiv=1605.07384|doi=10.1051/0004-6361/201628497|year=2016|last1=Soubiran|first1=Caroline|last2=Le Campion|first2=Jean-François|last3=Brouillet|first3=Nathalie|last4=Chemin|first4=Laurent|s2cid=119258214}}

{{cite journal | title=Observations of Binary Stars with the Differential Speckle Survey Instrument. VI. Measures during 2014 at the Discovery Channel Telescope | journal=The Astronomical Journal | volume=150 | issue=5 | page=151 | year=2015 | last1=Horch | first1=Elliott P. | last2=Belle | first2=Gerard T. van | last3=Davidson, Jr. | first3=James W. | last4=Ciastko | first4=Lindsay A. | last5=Everett | first5=Mark E. | last6=Bjorkman | first6=Karen S. | display-authors=1 | arxiv=1509.03498 | bibcode=2015AJ....150..151H | doi=10.1088/0004-6256/150/5/151 | s2cid=119115316 }}

{{cite journal|bibcode=2000A&A...363..239D|title=Rotation and lithium in single giant stars|journal=Astronomy and Astrophysics|volume=363|pages=239|arxiv=astro-ph/0010273|last1=De Medeiros|first1=J. R.|last2=Do Nascimento|first2=J. D.|last3=Sankarankutty|first3=S.|last4=Costa|first4=J. M.|last5=Maia|first5=M. R. G.|year=2000}}

{{cite journal|doi=10.1086/191527|title=High-resolution spectroscopic survey of 671 GK giants. I - Stellar atmosphere parameters and abundances|journal=The Astrophysical Journal Supplement Series|volume=74|pages=1075|year=1990|last1=McWilliam|first1=Andrew|bibcode=1990ApJS...74.1075M|doi-access=free}}

{{cite journal|bibcode=2000A&A...355L..27H|title=The Tycho-2 catalogue of the 2.5 million brightest stars|journal=Astronomy and Astrophysics|volume=355|pages=L27|last1=Høg|first1=E.|last2=Fabricius|first2=C.|last3=Makarov|first3=V. V.|last4=Urban|first4=S.|last5=Corbin|first5=T.|last6=Wycoff|first6=G.|last7=Bastian|first7=U.|last8=Schwekendiek|first8=P.|last9=Wicenec|first9=A.|year=2000}}

{{cite journal|bibcode= 2007MNRAS.374..664C|title=Medium-resolution Isaac Newton Telescope library of empirical spectra - II. The stellar atmospheric parameters|journal=Monthly Notices of the Royal Astronomical Society|volume=374|issue=2|pages=664–690|arxiv=astro-ph/0611618|doi=10.1111/j.1365-2966.2006.11196.x|year=2007|last1=Cenarro|first1=A. J.|last2=Peletier|first2=R. F.|last3=Sanchez-Blazquez|first3=P.|last4=Selam|first4=S. O.|last5=Toloba|first5=E.|last6=Cardiel|first6=N.|last7=Falcon-Barroso|first7=J.|last8=Gorgas|first8=J.|last9=Jimenez-Vicente|first9=J.|last10=Vazdekis|first10=A.|doi-access=free |s2cid=119428437}}

}}

Category:Serpens

Serpentis, 03

Category:K-type giants

Category:Durchmusterung objects

5674

135482

074649

Category:Binary stars